Permanent You can choose Battle Cards from under your black Z-Unison when choosing cards to use with a black card's Union-Potara skill from your hand.
AutoOnce per turn When your black card with a Union skill or black Z-Unison attacks or activates the Blocker skill, draw 1 card and it gets +5000 power for the turn.
Activate: BattleOnce per turn Use up to 2 black cards with 5000 combo power from under your Battle Cards or Z-Unisons—both black—in a combo with their skills negated for the turn.