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Summon - Badger (CMC:3)
If Rysorian Badger attacks and is not blocked, you may choose to have it deal no damage to defending player this turn. If you do so, remove from the game up to two target creatures from that player's graveyard. Gain 1 life for each creature removed in this way.
HM • ENHeather Hudson
™ & © 1993—1995 Wizards of the Coast
Legal in: Legacy,Vintage,Commander
Oracle Text (click to copy):
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4/15/2013 An ability that triggers when something "attacks and isn't blocked" triggers in the declare blockers step after blockers are declared if (1) that creature is attacking and (2) no creatures are declared to block it. It will trigger even if that creature was put onto the battlefield attacking rather than having been declared as an attacker in the declare attackers step.