Woodlurker Mimic 
Creature — Shapeshifter
$0.21 #29346 0.21 18.1 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.
Blazethorn Scarecrow81%
$0.32↑#20133↑0.1618.3 years
"This creature has wither as long as you control a green creature."
Shorecrasher Mimic80%
$0.18↓#304220.00↓18.1 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."
Thornwatch Scarecrow80%
$0.17↓#21091↑0.62↑18.3 years
"This creature has wither as long as you control a green creature."
Nightsky Mimic80%
$0.18↓#303200.1818.1 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."
Noxious Hatchling73%
$0.39↑#19999↑0.2718.1 years
"Whenever you cast a black spell, remove a -1/-1 counter from this creature."
Battlegate Mimic70%
$0.09↓#261210.00↓18.1 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."