Rapid Augmenter 


Creature — Otter Artificer
Haste
Whenever another creature you control with base power 1 enters, it gains haste until end of turn.
Whenever another creature you control enters, if it wasn't cast, put a +1/+1 counter on this creature and this creature can't be blocked this turn.
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Cards that do something similar 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.
Good-Fortune Unicorn 83%
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"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Boss's Chauffeur 82%
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"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Celebrity Fencer 82%
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"Whenever another creature you control enters, put a +1/+1 counter on this creature."
EPF Point Squad 82%
$0.12#22979
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Champion of Lambholt 82%
$4.25#551
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Skyknight Squire 82%
$0.33#5281
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Chainer, Nightmare Adept 80%
$0.80#1583
"Whenever a nontoken creature you control enters, if you didn't cast it from your hand, it gains haste until your next turn."
Shelinda, Yevon Acolyte 80%
$0.25#5812
"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."