Kayo, Berserker Runt [U-CRU002] (Crucible of War Unlimited) Unlimited Rainbow Foil

Whenever you play an attack action card with base power 6 or more [Power], roll a 6 sided die. On; 1 to 4 - Halve the attack's base [Power], rounded down. 5 or 6 - Double the attack's base [Power].