Riverfall Mimic 
Creature — Shapeshifter
$0.11 #31713 0.12 18.2 years
Whenever you cast a spell that's both blue and red, this creature has base power and toughness 3/3 until end of turn and can't be blocked this turn.
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Battlegate Mimic84%
$0.08↓#264650.00↓18.2 years
"Whenever you cast a spell that's both red and white, this creature has base power and toughness 4/2 until end of turn and gains first strike until end of turn."
Shorecrasher Mimic82%
$0.23↑#307580.00↓18.2 years
"Whenever you cast a spell that's both green and blue, this creature has base power and toughness 5/3 until end of turn and gains trample until end of turn."
Gloryscale Viashino78%
$0.15↑#24799↑0.0717.5 years
"Whenever you cast a multicolored spell, this creature gets +3/+3 until end of turn."
God-Pharaoh's Faithful77%
$0.14↑#20973↑0.109.3 years↓
"Whenever you cast a blue, black, or red spell, you gain 1 life."
Quirion Dryad76%
$0.09↓#25294↑0.1325.7 years↑
"Whenever you cast a spell that's white, blue, black, or red, put a +1/+1 counter on this creature."
Nightsky Mimic75%
$0.18↑#305930.00↓18.2 years
"Whenever you cast a spell that's both white and black, this creature has base power and toughness 4/4 until end of turn and gains flying until end of turn."
Ant-Man, Reformed Rogue74%
$0.21↑#260200.140.3 years↓
"Whenever you cast a blue spell, this card gets -1/-0 until end of turn and can't be blocked this turn."
Incursion Specialist72%
$0.12↑#283760.0613.7 years↓
"Whenever you cast your second spell each turn, this creature gets +2/+0 until end of turn and can't be blocked this turn."
Questing Druid // Seek the Beast72%
$0.35↑#8702↑0.113.1 years↓
"Whenever you cast a spell that's white, blue, black, or red, put a +1/+1 counter on this creature."
Mage Tower Referee72%
$0.11#23626↑0.01↓0.5 years↓
"Whenever you cast a multicolored spell, put a +1/+1 counter on this creature."
Snowmelt Stag70%
$0.12↑#24348↑0.00↓1.5 years↓
"During your turn, this creature has base power and toughness 5/2."
Thistledown Duo70%
$0.09↓#307780.00↓18.5 years
"Whenever you cast a blue spell, this creature gains flying until end of turn."
Zuko, Avatar Hunter70%
$0.55↑#13396↑0.22↑0.9 years↓
"Whenever you cast a red spell, create a 2/2 red Soldier creature token."
Hero of Precinct One70%
$0.26↑#8889↑0.00↓7.7 years↓
"Whenever you cast a multicolored spell, create a 1/1 white Human creature token."