Regal Leosaur 

Creature — Dinosaur Cat
$0.22 #16468 0.07 6.5 years
Mutate 

(If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Whenever this creature mutates, other creatures you control get +2/+1 until end of turn.
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Cards similar to Regal Leosaur 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.
Huntmaster Liger91%
$0.17↓#137330.056.5 years
"Whenever this creature mutates, other creatures you control get +X/+X until end of turn, where X is the number of times this creature has mutated."
+1 more matching line
Master of Pearls89%
$0.15↓#20637↓0.29↑12.1 years↑
"When this creature is turned face up, creatures you control get +2/+2 until end of turn."
+1 more matching line
Trumpeting Gnarr84%
$0.20↓#9193↑0.066.5 years
"Mutate 

If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
Lumithread Field82%
$0.24↑#25621↓0.0019.5 years↑
"Creatures you control get +0/+1."
+1 more matching line
Leonin Armorguard82%
$0.11↓#29294↓0.0017.5 years↑
"When this creature enters, creatures you control get +1/+1 until end of turn."
Civic Stalwart82%
$0.05↓#27513↓0.007.7 years↑
"When this creature enters, creatures you control get +1/+1 until end of turn."
Ampryn Tactician82%
$0.04↓#27557↓0.0011.3 years↑
"When this creature enters, creatures you control get +1/+1 until end of turn."
Inspiring Captain82%
$0.06↓#23025↓0.0010.5 years↑
"When this creature enters, creatures you control get +1/+1 until end of turn."
Earth-Origin Yak82%
$0.16↓#25327↓0.068.3 years↑
"When this creature enters, creatures you control get +1/+1 until end of turn."
Malamet War Scribe82%
$0.17↓#21739↓0.25↑2.9 years↓
"When this creature enters, creatures you control get +2/+1 until end of turn."
Warrior's Charge82%
$0.10↓#31991↓0.0029.5 years↑
"Creatures you control get +1/+1 until end of turn."
Virtuous Charge82%
$1.78↑#31228↓0.0527.5 years↑
"Creatures you control get +1/+1 until end of turn."
Ethereal Guidance82%
$0.08↓#27236↓0.1610.5 years↑
"Creatures you control get +2/+1 until end of turn."
Righteous Charge82%
$0.06↓#26198↓0.0028.3 years↑
"Creatures you control get +2/+2 until end of turn."
Necropanther79%
$0.15↓#12937↑0.136.5 years
"Mutate 

If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it."
Glorious Charge78%
$0.03↓#25633↓0.0017.3 years↑
"Creatures you control get +1/+1 until end of turn."
Warrior's Honor78%
$0.04↓#30201↓0.0029.7 years↑
"Creatures you control get +1/+1 until end of turn."
Dwarven Lightsmith78%
$0.09↓#31139↓0.078.4 years↑
"When this creature enters, creatures your team controls get +1/+1 until end of turn."