Andúril, Narsil Reforged {2}
Legendary Artifact — Equipment
Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
Whenever equipped creature attacks, put a +1/+1 counter on each creature you control. If you have the city's blessing, put two +1/+1 counters on each creature you control instead.
Equip {3}
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Cards that do something similar expected a card that isn't here?
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Invasion of New Capenna // Holy Frazzle-Cannon 85%
$0.21#9308
"Whenever equipped creature attacks, put a +1/+1 counter on that creature and each other creature you control that shares a creature type with it."
Dyadrine, Synthesis Amalgam 82%
$0.29#9426
"Whenever you attack, you may remove a +1/+1 counter from each of two creatures you control. If you do, draw a card and create a 2/2 colorless Robot artifact creature token."
Oran-Rief Ooze 80%
$0.26#8026
"Whenever this creature attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it."
Gideon, the Oathsworn 80%
#17669
"Whenever you attack with two or more non-this card creatures, put a +1/+1 counter on each of those creatures."