- If your Leader Card is yellow, all of your Battle Cards and your opponents Battle Cards with original energy costs of 5 or less have their skills negated, and all of your Battle Cards with energy costs of 1 get +5000 power. Play up to 2 yellow skill-less Battle Cards with energy costs of 1 from your Drop Area. If your Leader Card is yellow : Your opponent can only attack with Battle Cards once during their next turn.