Experiment Kraj

Experiment Kraj has all activated abilities of each other creature with a +1/+1 counter on it. {T}: Put a +1/+1 counter on target creature.

Momir Vig, Simic Visionary

Whenever you play a green creature spell, you may search your library for a creature card and reveal it. If you do, shuffle your library and put that card on top of it. Whenever you play a blue creature spell, reveal the top card of your library. If it's a creature card, put that card into your hand.

Omnibian

{T}: Target creature becomes a 3/3 Frog until end of turn.

Progenitor Mimic

You may have Progenitor Mimic enter the battlefield as a copy of any creature on the battlefield except it gains "At the beginning of your upkeep, if this creature isn't a token, put a token onto the battlefield that's a copy of this creature."

Vorel of the Hull Clade

{G}{U}, {T}: For each counter on target artifact, creature, or land, put another of those counters on that permanent.

Simic Sky Swallower

Flying, trample Shroud (This creature can't be the target of spells or abilities.)

Cloudfin Raptor

Flying 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.)

Elusive Krasis

Elusive Krasis is unblockable. 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.)

Gyre Sage

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} to your mana pool for each +1/+1 counter on Gyre Sage.

Miming Slime

Put an X/X green Ooze creature token onto the battlefield, where X is the greatest power among creatures you control.

Nimbus Swimmer

Flying Nimbus Swimmer enters the battlefield with X +1/+1 counters on it.

Urban Evolution

Draw three cards. You may play an additional land this turn.

Cytoplast Root-Kin

Graft 4 (This creature enters the battlefield with four +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.) When Cytoplast Root-Kin enters the battlefield, put a +1/+1 counter on each other creature you control with a +1/+1 counter on it. {2}: Move a +1/+1 counter from target creature you control onto Cytoplast Root-Kin.

Plaxcaster Frogling

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.) {2}: Target creature with a +1/+1 counter on it gains shroud until end of turn. (It can't be the target of spells or abilities.)

Voidslime

Counter target spell, activated ability, or triggered ability.

Fathom Mage

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 placed on Fathom Mage, you may draw a card.

Zameck Guildmage

{G}{U}: This turn, each creature you control enters the battlefield with an additional +1/+1 counter on it. {G}{U}, Remove a +1/+1 counter from a creature you control: Draw a card.

Vinelasher Kudzu

Whenever a land comes into play under your control, put a +1/+1 counter on Vinelasher Kudzu.

Coiling Oracle

Experiment One

Rapid Hybridization

Simic Growth Chamber

Simic Signet

Trygon Predator

Skitter Eel

{2}{U}: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.)

Guardian Project

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.

Trollbred Guardian

{2}{G}: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.) Each creature you control with a +1/+1 counter on it has trample.

Applied Biomancy

Choose one or both — • Target creature gets +1/+1 until end of turn. • Return target creature to its owner's hand.

Frilled Mystic

Flash When Frilled Mystic enters the battlefield, you may counter target spell.

Galloping Lizrog

Trample When Galloping Lizrog enters the battlefield, you may remove any number of +1/+1 counters from among creatures you control. If you do, put twice that many +1/+1 counters on Galloping Lizrog.

Simic Ascendancy

{1}{G}{U}: Put a +1/+1 counter on target creature you control. Whenever one or more +1/+1 counters are put on a creature you control, put that many growth counters on Simic Ascendancy. At the beginning of your upkeep, if Simic Ascendancy has twenty or more growth counters on it, you win the game.

Zegana, Utopian Speaker

When Zegana, Utopian Speaker enters the battlefield, if you control another creature with a +1/+1 counter on it, draw a card. {4}{G}{U}: Adapt 4. (If this creature has no +1/+1 counters on it, put four +1/+1 counters on it.) Each creature you control with a +1/+1 counter on it has trample.

Simic Guildgate

Simic Guildgate enters the battlefield tapped. {T}: Add {G} or {U}.

Island

({T}: Add {U}.)

Forest

({T}: Add {G}.)