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When that creature dies this turn, return a creature card from its owner's graveyard to the battlefield under the control of that creature's owner
However throughout Magic there are many ways to tap a creature without attacking including convoke, making mana dorks with Nature's Embrace, bolster on Gleam of Authority, straight up green token generators in Presence of Gond, and one of the oldest, Samite Blessing
ACE SPEC cards are a fairly new gameplay mechanic to return to the Trading Card Game after its original debut back in 2012
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While Atraxa and Valgavoth are probably still better reanimation targets, Koma is a creature you can reasonably hardcast