Cathars' Crusade {3}{W}{W}
Enchantment
Whenever a creature you control enters, put a +1/+1 counter on each creature you control.
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Cards that do something similar expected a card that isn't here?
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Kellan Joins Up 89%
$0.32#7462
"Whenever a legendary creature you control enters, put a +1/+1 counter on each creature you control."
Celes, Rune Knight 87%
$1.56#5241
"Whenever one or more other creatures you control enter, if one or more of them entered from a graveyard or was cast from a graveyard, put a +1/+1 counter on each creature you control."