Laplacia, the Demon of Fate (ABC-WD-027 SR) [Arcana Battle Colosseum]

[CONT] Your opponent plays with top card of his or her main deck revealed. [CONT] You may look a the top card of your main deck at any time. [ACT] Tap: Put the top card of your main deck and the top card of your opponent's main deck into their owner's graveyard.