{T}: Add one mana of any color in your commander's color identity.

Astral Cornucopia enters the battlefield with X charge counters on it. {T}: Choose a color. Add one mana of that color for each charge counter on Astral Cornucopia.

Apocalypse Hydra enters the battlefield with X +1/+1 counters on it. If X is 5 or more, it enters the battlefield with an additional X +1/+1 counters on it. {1}{R}, Remove a +1/+1 counter from Apocalypse Hydra: It deals 1 damage to any target.

Flying {T}: Add one mana of any color.

{T}: Add {G}. Put a -1/-1 counter on Devoted Druid: Untap Devoted Druid.

{T}: Add {G}.

If a red instant or sorcery spell you control would deal damage, it deals double that damage instead.

Flying Whenever Flameblast Dragon attacks, you may pay {X}{R}. If you do, Flameblast Dragon deals X damage to any target.

{T}: Add {G}.

Vigilance Hydra spells you cast cost {4} less to cast. Whenever a creature you control becomes the target of a spell, Gargos, Vicious Watcher fights up to one target creature you don't control.

When you cast this spell, reveal the top X cards of your library. You may put a nonland permanent card with mana value X or less from among them onto the battlefield. Then shuffle the rest into your library. Genesis Hydra enters the battlefield with X +1/+1 counters on it.

Each spell you cast that's red or green costs {1} less to cast.

{X}{X}{1}: Destroy target noncreature artifact with mana value X.

Hungering Hydra enters the battlefield with X +1/+1 counters on it. Hungering Hydra can't be blocked by more than one creature. Whenever Hungering Hydra is dealt damage, put that many +1/+1 counters on it. (It must survive the damage to get the counters.)

{T}: Add {G}. If you control four or more creatures, add {G}{G} instead.

{T}: Add {G}.

This spell can't be countered. Haste, protection from blue Mistcutter Hydra enters the battlefield with X +1/+1 counters on it.

{X}{X}{G}: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.) When Polukranos, World Eater becomes monstrous, it deals X damage divided as you choose among any number of target creatures your opponents control. Each of those creatures deals damage equal to its power to Polukranos.

Primordial Hydra enters the battlefield with X +1/+1 counters on it. At the beginning of your upkeep, double the number of +1/+1 counters on Primordial Hydra. Primordial Hydra has trample as long as it has ten or more +1/+1 counters on it.

Protean Hydra enters the battlefield with X +1/+1 counters on it. If damage would be dealt to Protean Hydra, prevent that damage and remove that many +1/+1 counters from it. Whenever a +1/+1 counter is removed from Protean Hydra, put two +1/+1 counters on it at the beginning of the next end step.

Whenever Radha, Heir to Keld attacks, you may add {R}{R}. {T}: Add {G}.

Each creature you control with a mana ability gets +2/+2. Whenever a creature you control with a mana ability attacks, untap it. Whenever you cast a spell, if at least seven mana was spent to cast it, untap target creature. It gets +7/+7 and gains trample until end of turn.

Rock Hydra enters the battlefield with X +1/+1 counters on it. For each 1 damage that would be dealt to Rock Hydra, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage. {R}: Prevent the next 1 damage that would be dealt to Rock Hydra this turn. {R}{R}{R}: Put a +1/+1 counter on Rock Hydra. Activate only during your upkeep.

Other tapped creatures you control have deathtouch. Other untapped creatures you control have hexproof. {1}, {T}: Untap another target creature or land you control.

Double strike Savageborn Hydra enters the battlefield with X +1/+1 counters on it. {1}{R/G}: Put a +1/+1 counter on Savageborn Hydra. Activate only as a sorcery.

Flying, haste Shivan Devastator enters the battlefield with X +1/+1 counters on it.

Reach {X}{G}{G}: Silklash Spider deals X damage to each creature with flying.

Flying {2}: Steel Hellkite gets +1/+0 until end of turn. {X}: Destroy each nonland permanent with mana value X whose controller was dealt combat damage by Steel Hellkite this turn. Activate only once each turn.

Trample, haste If you would put one or more counters on a permanent or player, put twice that many of each of those kinds of counters on that permanent or player instead. If an opponent would put one or more counters on a permanent or player, they put half that many of each of those kinds of counters on that permanent or player instead, rounded down.

Walking Ballista enters the battlefield with X +1/+1 counters on it. {4}: Put a +1/+1 counter on Walking Ballista. Remove a +1/+1 counter from Walking Ballista: It deals 1 damage to any target.

Creatures you control have hexproof. {1}{G}: Regenerate target creature. (The next time it would be destroyed, instead tap it, remove it from combat, and heal all damage on it.)

When Garruk's Uprising enters the battlefield, if you control a creature with power 4 or greater, draw a card. Creatures you control have trample. (They can deal excess combat damage to the player or planeswalker they're attacking.) Whenever a creature with power 4 or greater enters the battlefield under your control, draw a card.

Sacrifice a creature: Draw cards equal to the sacrificed creature's power, then discard three cards.

Shroud (This enchantment can't be the target of spells or abilities.) {X}: Put X tower counters on Helix Pinnacle. At the beginning of your upkeep, if there are 100 or more tower counters on Helix Pinnacle, you win the game.

Enchant creature Enchanted creature can attack as though it had haste. {0}: Untap enchanted creature. Activate only during your turn and only once each turn.

Destroy target permanent. Its controller creates a 3/3 green Beast creature token.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.

Street Spasm deals X damage to target creature without flying you don't control. Overload {X}{X}{R}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Target creature you control gets +X/+X and gains hexproof and indestructible until end of turn. (A creature with hexproof and indestructible can't be the target of spells or abilities your opponents control. Damage and effects that say "destroy" don't destroy it.)

Blast Zone enters the battlefield with a charge counter on it. {T}: Add {C}. {X}{X}, {T}: Put X charge counters on Blast Zone. {3}, {T}, Sacrifice Blast Zone: Destroy each nonland permanent with mana value equal to the number of charge counters on Blast Zone.

{T}: Add one mana of any color in your commander's color identity.

Copperline Gorge enters the battlefield tapped unless you control two or fewer other lands. {T}: Add {R} or {G}.

Dwarven Hold enters the battlefield tapped. You may choose not to untap Dwarven Hold during your untap step. At the beginning of your upkeep, if Dwarven Hold is tapped, put a storage counter on it. {T}, Remove any number of storage counters from Dwarven Hold: Add {R} for each storage counter removed this way.

Dwarven Ruins enters the battlefield tapped. {T}: Add {R}. {T}, Sacrifice Dwarven Ruins: Add {R}{R}.

{T}: Add {C}. {R/G}, {T}: Add {R}{R}, {R}{G}, or {G}{G}.

({T}: Add {G}.)

{T}: Add {C}. {1}, {T}: Put a storage counter on Fungal Reaches. {1}, Remove X storage counters from Fungal Reaches: Add X mana in any combination of {R} and/or {G}.

Gruul Turf enters the battlefield tapped. When Gruul Turf enters the battlefield, return a land you control to its owner's hand. {T}: Add {R}{G}.

{T}: Add {C}. {3}, {T}, Sacrifice Haunted Fengraf: Return a creature card at random from your graveyard to your hand.

Havenwood Battleground enters the battlefield tapped. {T}: Add {G}. {T}, Sacrifice Havenwood Battleground: Add {G}{G}.

Jungle Basin enters the battlefield tapped. When Jungle Basin enters the battlefield, sacrifice it unless you return an untapped Forest you control to its owner's hand. {T}: Add {C}{G}.

{T}: Add {C}. {T}: Add {R} or {G}. Karplusan Forest deals 1 damage to you.

{T}: Add {C}. {X}{R}{G}, {T}: Target creature gets +X/+0 and gains trample until end of turn.

If you control two or more other lands, Lair of the Hydra enters the battlefield tapped. {T}: Add {G}. {X}{G}: Until end of turn, Lair of the Hydra becomes an X/X green Hydra creature. It's still a land. X can't be 0.

({T}: Add {R}.)

{T}: Add {C}. {T}, Pay 1 life: Add {R}. {2}{R}{R}, {T}, Sacrifice a Desert: Ramunap Ruins deals 2 damage to each opponent.

{T}: Add one mana of any type that a land you control could produce.

Rockfall Vale enters the battlefield tapped unless you control two or more other lands. {T}: Add {R} or {G}.

Rootbound Crag enters the battlefield tapped unless you control a Mountain or a Forest. {T}: Add {R} or {G}.

Spire Garden enters the battlefield tapped unless you have two or more opponents. {T}: Add {R} or {G}.

({T}: Add {R} or {G}.) As Stomping Ground enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

Temple of Abandon enters the battlefield tapped. When Temple of Abandon enters the battlefield, scry 1. {T}: Add {R} or {G}.

Banefire deals X damage to any target. If X is 5 or more, this spell can't be countered and the damage can't be prevented.

Bonfire of the Damned deals X damage to target player or planeswalker and each creature that player or that planeswalker's controller controls. Miracle {X}{R} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

Choose one or more — • Clan Defiance deals X damage to target creature with flying. • Clan Defiance deals X damage to target creature without flying. • Clan Defiance deals X damage to target player or planeswalker.

Destroy target artifact, target creature, target enchantment, and target land. (You can't cast this spell unless you have legal choices for all its targets.)

Demonfire deals X damage to any target. If a creature dealt damage this way would die this turn, exile it instead. Hellbent — If you have no cards in hand, this spell can't be countered and the damage can't be prevented.

Devil's Play deals X damage to any target. Flashback {X}{R}{R}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Disintegrate deals X damage to any target. If it's a creature, it can't be regenerated this turn, and if it would die this turn, exile it instead.

This spell costs {1} more to cast for each target beyond the first. Fireball deals X damage divided evenly, rounded down, among any number of targets.

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.) Jaya's Immolating Inferno deals X damage to each of up to three targets.

Kicker {R} (You may pay an additional {R} as you cast this spell.) If this spell was kicked, it has split second. (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) Molten Disaster deals X damage to each creature without flying and each player.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Red Sun's Zenith deals X damage to any target. If a creature dealt damage this way would die this turn, exile it instead. Shuffle Red Sun's Zenith into its owner's library.

Savage Twister deals X damage to each creature.

Target creature you control deals damage equal to its power to each of X target creatures and/or planeswalkers.

Choose a color. Sudden Demise deals X damage to each creature of the chosen color.

Search your library for a land card, reveal it, put it into your hand, then shuffle.

Destroy target artifact you don't control. Overload {4}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Whenever you put one or more counters on a permanent or player, All Will Be One deals that much damage to target opponent, creature an opponent controls, or planeswalker an opponent controls.

Create X 1/1 green Forest Dryad land creature tokens. (They're affected by summoning sickness.)

{1}, {T}: Add {R}{G}.

Trample Kalonian Hydra enters the battlefield with four +1/+1 counters on it. Whenever Kalonian Hydra attacks, double the number of +1/+1 counters on each creature you control.

Reach Modified creatures you control have trample. (Equipment, Auras you control, and counters are modifications.) Whenever a modified creature you control deals combat damage to a player, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

{1}, {T}: Add {R}{G}.

{T}: Add one mana of any color. {1}, {T}: Untap target legendary creature you control.

Sacrifice Sakura-Tribe Elder: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Reach, trample, protection from multicolored Stonecoil Serpent enters the battlefield with X +1/+1 counters on it.