If you cast a spell this turn, you can't attack with creatures.
If you attacked with creatures this turn, you can't cast spells.
Whenever chaos ensues, you gain life equal to the number of cards in your hand.
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1 Jun 2012
Prahv only cares about the turn-based action of declaring attackers. If an effect allows you to put a creature onto the battlefield attacking, you can cast spells later that turn.