Summon - Thrull (CMC:3)
If Mindstab Thrull attacks and is not blocked, you may sacrifice it to force the player it attacked to discard three cards. If you do so, it deals no damage during combat this turn. If that player does not have enough cards, his or her entire hand is discarded.
FE • ENHeather Hudson
™ & © 1993—1994 Wizards of the Coast
Legal in: Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander
Oracle Text (click to copy):
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10/4/2004 The defending player gets to choose which cards they discard. 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.