The Court of Heckles

Whenever a rogue you control attacks, roll a d20. Defending player reveals that many cards from
the top of their library. For each card revealed
this way, flip a coin. For each coin flip won, the attacking rogue gets +1/+0 until end of turn and
the defending player puts the revealed card into
their graveyard. That player then puts the
remaining revealed cards on the bottom of their library in a random order.
Chances are, chaos reigns.