When Contagion Engine enters the battlefield, put a -1/-1 counter on each creature target player controls. {4}, {T}: Proliferate, then proliferate again. (Choose any number of permanents and/or players, then give each another counter of each kind already there. Then do it again.)

Creatures your opponents control with hexproof can be the targets of spells and abilities you control as though they didn't have hexproof. {3}, Sacrifice Glaring Spotlight: Creatures you control gain hexproof until end of turn and can't be blocked this turn.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) When Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.

{U}: Exile Aetherling. Return it to the battlefield under its owner's control at the beginning of the next end step. {U}: Aetherling can't be blocked this turn. {1}: Aetherling gets +1/-1 until end of turn. {1}: Aetherling gets -1/+1 until end of turn.

Reach {3}{G}{G}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) When Arbor Colossus becomes monstrous, destroy target creature with flying an opponent controls.

{T}: Draw three cards. {2}{U}{U}: Return Arcanis the Omnipotent to its owner's hand.

When Coiling Oracle enters the battlefield, reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put that card into your hand.

Trample Each creature you control with a +1/+1 counter on it has trample.

Graft 2 (This creature enters the battlefield with two +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.) {U}, {T}: Gain control of target creature with a +1/+1 counter on it for as long as Cytoplast Manipulator remains on the battlefield.

{G}, Sacrifice Dawntreader Elk: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) Remove two +1/+1 counters from Experiment One: Regenerate Experiment One. (The next time this creature would be destroyed, instead tap it, remove it from combat, and heal all damage on it.)

When Ezuri, Stalker of Spheres enters the battlefield, you may pay {3}. If you do, proliferate twice. Whenever you proliferate, draw a card.

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) Whenever a +1/+1 counter is put on Fathom Mage, you may draw a card.

Whenever a player casts a spell, you may put a +1/+1 counter on Forgotten Ancient. At the beginning of your upkeep, you may move any number of +1/+1 counters from Forgotten Ancient onto other creatures.

{2}{G/U}, {Q}: Double the number of each kind of counter on target permanent. ({Q} is the untap symbol.)

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) {T}: Add {G} for each +1/+1 counter on Gyre Sage.

You may cast Harbinger of the Tides as though it had flash if you pay {2} more to cast it. (You may cast it any time you could cast an instant.) When Harbinger of the Tides enters the battlefield, you may return target tapped creature an opponent controls to its owner's hand.

{0}: Until end of turn, Jodah's Avenger gets -1/-1 and gains your choice of double strike, protection from red, vigilance, or shadow. (A creature with shadow can block or be blocked by only creatures with shadow.)

Reach (This creature can block creatures with flying.) Wither (This deals damage to creatures in the form of -1/-1 counters.)

Flying {1}{U}, {Q}: Target opponent exiles the top card of their library. Until end of turn, you may play that card. ({Q} is the untap symbol.)

Each other creature you control enters the battlefield with a number of additional +1/+1 counters on it equal to Master Biomancer's power and as a Mutant in addition to its other types.

{0}: Mist Dragon gains flying. (This effect lasts indefinitely.) {0}: Mist Dragon loses flying. (This effect lasts indefinitely.) {3}{U}{U}: Mist Dragon phases out. (While it's phased out, it's treated as though it doesn't exist. It phases in before you untap during your next untap step.)

{U}: Untap Morphling. {U}: Morphling gains flying until end of turn. {U}: Morphling gains shroud until end of turn. (It can't be the target of spells or abilities.) {1}: Morphling gets +1/-1 until end of turn. {1}: Morphling gets -1/+1 until end of turn.

If Mossbridge Troll would be destroyed, regenerate it. Tap any number of untapped creatures you control other than Mossbridge Troll with total power 10 or greater: Mossbridge Troll gets +20/+20 until end of turn.

Flying When Pilgrim's Eye enters the battlefield, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Prime Speaker Zegana enters the battlefield with X +1/+1 counters on it, where X is the greatest power among other creatures you control. When Prime Speaker Zegana enters the battlefield, draw cards equal to its power.

Flying {U}: If target spell has only one target and that target is Quicksilver Dragon, change that spell's target to another creature. Morph {4}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Whenever Riptide Entrancer deals combat damage to a player, you may sacrifice it. If you do, gain control of target creature that player controls. (This effect lasts indefinitely.) Morph {U}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Graft 3 (This creature enters the battlefield with three +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.) {1}{G}: Until end of turn, target creature with a +1/+1 counter on it gains "Whenever this creature deals combat damage to a creature, destroy that creature at end of combat."

({G/U} can be paid with either {G} or {U}.) {1}{G}: Move a +1/+1 counter from target creature onto another target creature with the same controller. {1}{U}: Attach target Aura attached to a permanent to another permanent with the same controller.

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) {T}, Remove one or more +1/+1 counters from Simic Manipulator: Gain control of target creature with power less than or equal to the number of +1/+1 counters removed this way.

{U}: Untap Simic Ragworm.

Spike Weaver enters the battlefield with three +1/+1 counters on it. {2}, Remove a +1/+1 counter from Spike Weaver: Put a +1/+1 counter on target creature. {1}, Remove a +1/+1 counter from Spike Weaver: Prevent all combat damage that would be dealt this turn.

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.

Spells and abilities your opponents control can't cause you to sacrifice permanents.

{G}: Thornling gains haste until end of turn. {G}: Thornling gains trample until end of turn. {G}: Thornling gains indestructible until end of turn. {1}: Thornling gets +1/-1 until end of turn. {1}: Thornling gets -1/+1 until end of turn.

Flying Whenever Thrummingbird deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Hexproof (This creature can't be the target of spells or abilities your opponents control.) {1}{G}: Regenerate Troll Ascetic.

Flying Whenever Trygon Predator deals combat damage to a player, you may destroy target artifact or enchantment that player controls.

Vastwood Hydra enters the battlefield with X +1/+1 counters on it. When Vastwood Hydra dies, you may distribute a number of +1/+1 counters equal to the number of +1/+1 counters on Vastwood Hydra among any number of creatures you control.

Whenever a creature an opponent controls becomes the target of a spell or ability you control, gain control of that creature for as long as you control Willbreaker.

Enchant creature Enchanted creature has hexproof and can't be blocked by more than one creature.

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.)

Enchant artifact or creature When Awakened Awareness enters the battlefield, put X +1/+1 counters on enchanted permanent. As long as enchanted permanent is a creature, it has base power and toughness 1/1.

If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead.

Whenever you cast a spell, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Whenever a creature you control is dealt damage, put a +1/+1 counter on it. (It must survive the damage to get the counter.)

Draw a card for each creature you control with a +1/+1 counter on it. Those creatures gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)

Prevent all combat damage that would be dealt this turn. Flashback {2}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

This spell can't be countered. The next creature spell you cast this turn can be cast as though it had flash. That spell can't be countered. That creature enters the battlefield with an additional +1/+1 counter on it.

Choose one — • Target creature gets +3/+3 until end of turn. • Permanents you control gain hexproof until end of turn. • Return target creature to its owner's hand.

Until end of turn, target creature loses all abilities and becomes a green Snake with base power and toughness 1/1. Draw a card.

Strive — This spell costs {1}{G} more to cast for each target beyond the first. Choose any number of target creatures. Double the number of +1/+1 counters on each of them.

({T}: Add {G}.)

Hinterland Harbor enters the battlefield tapped unless you control a Forest or an Island. {T}: Add {G} or {U}.

({T}: Add {U}.)

Llanowar Reborn enters the battlefield tapped. {T}: Add {G}. Graft 1 (This land enters the battlefield with a +1/+1 counter on it. Whenever a creature enters the battlefield, you may move a +1/+1 counter from this land onto it.)

Lonely Sandbar enters the battlefield tapped. {T}: Add {U}. Cycling {U} ({U}, Discard this card: Draw a card.)

{T}: Add {C}. {1}, {T}: Add one mana of any color in your commander's color identity. If you spend this mana to cast your commander, it enters the battlefield with a number of additional +1/+1 counters on it equal to the number of times it's been cast from the command zone this game.

Oran-Rief, the Vastwood enters the battlefield tapped. {T}: Add {G}. {T}: Put a +1/+1 counter on each green creature that entered the battlefield this turn.

Remote Isle enters the battlefield tapped. {T}: Add {U}. Cycling {2} ({2}, Discard this card: Draw a card.)

Slippery Karst enters the battlefield tapped. {T}: Add {G}. Cycling {2} ({2}, Discard this card: Draw a card.)

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

Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. Cycling {2} ({2}, Discard this card: Draw a card.)

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle. Flashback {4}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Choose two — • Target player gains 7 life. • Put target noncreature permanent on top of its owner's library. • Target player shuffles their graveyard into their library. • Search your library for a creature card, reveal it, put it into your hand, then shuffle.

Shuffle your library, then reveal the top card. If it's a nonland card, you may cast it without paying its mana cost. If it's a land card, you may put it onto the battlefield and return Unexpected Results to its owner's hand.

Return target permanent card from your graveyard to your hand. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)