Greatsword of Tyr {1}{W}
Artifact — Equipment
Whenever equipped creature attacks, put a +1/+1 counter on it and tap up to one target creature defending player controls.
Equip {W} ({W}: Attach to target creature you control. Equip only as a sorcery.)
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Cards that do something similar expected a card that isn't here?
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Aetherstorm Roc 83%
$0.29#7755
"Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls."