Eldrazi Mimic 
Creature — Eldrazi
$1.12 #10608 0.00 10.6 years
Whenever another colorless creature you control enters, you may change this creature's base power and toughness to that creature's power and toughness until end of turn.
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Cards similar to Eldrazi 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.
Halfdane83%
$35.20↑#28300↓0.60↑32.3 years↑
"At the beginning of your upkeep, change this card's base power and toughness to the power and toughness of target creature other than this card until the end of your next upkeep."
Hulkling, Burgeoning Bruiser77%
$0.19↓#22539↓0.000.2 years↓
"Whenever another creature you control enters, if it has greater power or toughness than this card, put a +1/+1 counter on this card."
Amplifire73%
$0.19↓#24771↓0.19↑7.6 years↓
"At the beginning of your upkeep, reveal cards from the top of your library until you reveal a creature card. Until your next turn, this creature's base power becomes twice that card's power and its base toughness becomes twice that card's toughness. Put the revealed cards on the bottom of your library in a random order."
Unruly Krasis72%
$0.41↓#21964↓0.062.5 years↓
"Whenever this creature attacks, you may have the base power and toughness of another target creature you control become X/X until end of turn, where X is this creature's power."
Shelinda, Yevon Acolyte71%
$0.25↓#5586↑0.47↑1.2 years↓
"Whenever another creature you control enters, put a +1/+1 counter on that creature if its power is less than this card's power. Otherwise, put a +1/+1 counter on this card."
Hamletback Goliath71%
$0.19↓#90360.0018.9 years↑
"Whenever another creature enters, you may put X +1/+1 counters on this creature, where X is that creature's power."
Belligerent Yearling71%
$0.23↓#88940.002.8 years↓
"Whenever another Dinosaur you control enters, you may have this creature's base power become equal to that creature's power until end of turn."
Galion, Elvenking's Butler70%
$0.15↓#22926↓0.000.1 years↓
"Whenever this card attacks, choose up to one other target creature you control. Its base power and toughness become equal to this card's power and toughness until end of turn."
Devilish Valet70%
$0.33↓#3426↑0.38↑4.4 years↓
"Whenever another creature you control enters, double this creature's power until end of turn."
Evolving Adaptive70%
$0.16↓#16826↓0.33↑3.6 years↓
"Whenever another creature you control enters, if that creature has greater power or toughness than this creature, put an oil counter on this creature."