Endless One enters the battlefield with X +1/+1 counters on it.

Each other non-Human creature you control enters the battlefield with an additional +1/+1 counter on it.

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.)

Enchant creature When Hydra's Growth enters the battlefield, put a +1/+1 counter on enchanted creature. At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature.

Put five +1/+1 counters on target creature. If this spell was cast from a graveyard, put ten +1/+1 counters on that creature instead. Flashback {5}{G}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Put a +1/+1 counter on target creature, two +1/+1 counters on another target creature, and three +1/+1 counters on a third target creature.

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

Put X +1/+1 counters on target creature, where X is that creature's power.

Trample Other creatures you control have trample. Whenever another nontoken creature enters the battlefield under your control, put a +1/+1 counter on it. It gains haste until end of turn.

Flying, first strike At the beginning of your upkeep, exile the top two cards of your library. You may play them this turn. If you exiled a land card this way, create a 3/1 red Dinosaur creature token. If you exiled a nonland card this way, create a Treasure token.

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

Whenever a nontoken creature enters the battlefield under your control, if it doesn't have the same name as another creature you control or a creature card in your graveyard, draw a card.

This spell can't be countered. Draw cards equal to the greatest toughness among creatures you control, then put any number of creature cards from your hand onto the battlefield.

At the beginning of your draw step, you may draw two additional cards. If you do, choose two cards in your hand drawn this turn. For each of those cards, pay 4 life or put the card on top of your library.

{3}{R}{R}: Untap all creatures you control. After this main phase, there is an additional combat phase followed by an additional main phase. Activate only as a sorcery.

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.) Trample, ward {2} Ancient Imperiosaur enters the battlefield with two +1/+1 counters on it for each creature that convoked it.

Whenever Hydra Omnivore deals combat damage to an opponent, it deals that much damage to each other opponent.

Whenever you attack, if it's the first combat phase of the turn, untap all attacking creatures. They gain first strike until end of turn. After this phase, there is an additional combat phase. Choose a Background (You can have a Background as a second commander.)

Castle Embereth enters the battlefield tapped unless you control a Mountain. {T}: Add {R}. {1}{R}{R}, {T}: Creatures you control get +1/+0 until end of turn.

Castle Garenbrig enters the battlefield tapped unless you control a Forest. {T}: Add {G}. {2}{G}{G}, {T}: Add six {G}. Spend this mana only to cast creature spells or activate abilities of creatures.

({T}: Add {R} or {G}.) Cinder Glade enters the battlefield tapped unless you control two or more basic lands.

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

({T}: Add {G}.)

When Maestros Theater enters the battlefield, sacrifice it. When you do, search your library for a basic Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle and you gain 1 life.

({T}: Add {R}.)

Pit of Offerings enters the battlefield tapped. When Pit of Offerings enters the battlefield, exile up to three target cards from graveyards. {T}: Add {C}. {T}: Add one mana of any of the exiled cards' colors.

You have no maximum hand size. {T}: Add {C}.

Restless Ridgeline enters the battlefield tapped. {T}: Add {R} or {G}. {2}{R}{G}: Restless Ridgeline becomes a 3/4 red and green Dinosaur creature until end of turn. It's still a land. Whenever Restless Ridgeline attacks, another target attacking creature gets +2/+0 until end of turn. Untap that creature.

When Dawnglade Regent enters the battlefield, you become the monarch. As long as you're the monarch, permanents you control have hexproof.

Creature spells you control can't be countered. Nontoken creatures you control have riot. (They enter the battlefield with your choice of a +1/+1 counter or haste.)

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control.) Equip {1}

Draw a card if an opponent has cast a blue or black spell this turn. Spells you control can't be countered this turn. You and permanents you control gain hexproof from blue and from black until end of turn. (You and they can't be the targets of blue or black spells or abilities your opponents control.)

This spell can't be countered. {R/G}: Target spell can't be countered.

Whenever Tuya Bearclaw attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control.

{T}: Add {C}{C}{C}. {3}, {T}, Sacrifice Dreamstone Hedron: Draw three cards.

{T}: Add {G}.

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

Creature spells you cast with power 4 or greater cost {2} less to cast. Whenever Goreclaw, Terror of Qal Sisma attacks, each creature you control with power 4 or greater gets +1/+1 and gains trample until end of turn.

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

Trample Whenever Ilharg, the Raze-Boar attacks, you may put a creature card from your hand onto the battlefield tapped and attacking. Return that creature to your hand at the beginning of the next end step. When Ilharg, the Raze-Boar dies or is put into exile from the battlefield, you may put it into its owner's library third from the top.

{T}: Add one mana of any color. If you control a creature with power 4 or greater, add two mana of any one color instead.

If one or more +1/+1 counters would be put on a permanent you control, that many plus one +1/+1 counters are put on that permanent instead. {T}: Add X mana of any one color, where X is Kami of Whispered Hopes's power.

If Leyline of Abundance is in your opening hand, you may begin the game with it on the battlefield. Whenever you tap a creature for mana, add an additional {G}. {6}{G}{G}: Put a +1/+1 counter on each creature you control.

{T}: Add {G}.

You may play an additional land on each of your turns. Play with the top card of your library revealed. You may play lands from the top of your library.

{T}: Add {C}{C}.

You have no maximum hand size. {T}: Add {C}.

Search your library for up to X basic land cards, where X is the greatest power among creatures you control. Put those cards onto the battlefield tapped, then shuffle.

Reach Ulvenwald Hydra's power and toughness are each equal to the number of lands you control. When Ulvenwald Hydra enters the battlefield, you may search your library for a land card, put it onto the battlefield tapped, then shuffle.

Put target card from your graveyard on top of your library.

Target creature you control fights target creature the opponent to your left controls. Then that player may copy this spell and may choose new targets for the copy.

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

Whenever an opponent casts a noncreature spell, Cindervines deals 1 damage to that player. {1}, Sacrifice Cindervines: Destroy target artifact or enchantment. Cindervines deals 2 damage to that permanent's controller.

Put a +1/+1 counter on target creature you control. Then that creature deals damage equal to its power to target creature or planeswalker you don't control.

Put a +1/+1 counter on target creature you control, then it fights target creature you don't control. (Each deals damage equal to its power to the other.) Adamant — If at least three green mana was spent to cast this spell, the creature you control gains indestructible until end of turn.

{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.

When Terastodon enters the battlefield, you may destroy up to three target noncreature permanents. For each permanent put into a graveyard this way, its controller creates a 3/3 green Elephant creature token.

Each player shuffles all cards from their hand and all permanents they own into their library, then draws that many cards. Each player may put any number of land cards from their hand onto the battlefield. Exile The Great Aurora.

At the beginning of your upkeep, if an opponent controls three or more creatures, sacrifice Defense of the Heart, search your library for up to two creature cards, put those cards onto the battlefield, then shuffle.

Search your library and/or graveyard for a creature card with mana value X or less and put it onto the battlefield. If you search your library this way, shuffle. If X is 10 or more, creatures you control get +X/+X and gain haste until end of turn.

When Protean Hulk dies, search your library for any number of creature cards with total mana value 6 or less, put them onto the battlefield, then shuffle.