Kayo, Berserker Runt (CRU002) (1st Edition) Rainbow Foil - Crucible of War

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