Gyruda, Doom of Depths

Companion — Your starting deck contains only cards with even converted mana costs. (If this card is your chosen companion, you may cast it once from outside the game.)
When Gyruda, Doom of Depths enters the battlefield, each player puts the top four cards of their library into their graveyard. Put a creature card with an even converted mana cost from among those cards onto the battlefield under your control.