Woodlurker Mimic 
Creature — Shapeshifter
$0.24 #29607 0.00 18.2 years
Whenever you cast a spell that's both black and green, this creature has base power and toughness 4/5 until end of turn and gains wither until end of turn. (It deals damage to creatures in the form of -1/-1 counters.)
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Cards similar to Woodlurker Mimic expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Shorecrasher Mimic82%
$0.23↓#307580.0018.2 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."
Nightsky Mimic80%
$0.18↓#305930.0018.2 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."
Blazethorn Scarecrow80%
$0.31↑#20575↑0.0018.5 years
"This creature has wither as long as you control a green creature."
Thornwatch Scarecrow80%
$0.18↓#21564↑0.0018.5 years
"This creature has wither as long as you control a green creature."
Noxious Hatchling74%
$0.38↑#20352↑0.21↑18.2 years
"Whenever you cast a black spell, remove a -1/-1 counter from this creature."
Battlegate Mimic70%
$0.08↓#264650.0018.2 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."
Emberstrike Duo70%
$0.09↓#303640.0018.5 years
"Whenever you cast a black spell, this creature gets +1/+1 until end of turn."
Corrosive Mentor70%
$7.00↑#10341↑0.44↑18.5 years
"Black creatures you control have wither."