High Noon At Thunder Junction

Whenever a player draws their second card each turn, any of their opponents may say "DRAW!". The first opponent to do so clashes with that player. The player that wins the clash creates two 1/1 black Assassin creature tokens. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher mana value.)

Whenever Chaos ensues, draw a card.

Format legality