Beyrin, Mender of Power

{1}{u}{b}: Each player puts the top card of his or her library into his or her graveyard. Beyrin, Mender of Power gets +X/+X until end of turn, where X is the total converted mana cost of all cards put into the graveyard this way. If the total converted mana cost is five or less, Beyrin, Mender of Power gains flying until end of turn. If the total converted mana cost is ten or greater, Beyrin, Mender of Power gains flying and hexproof until end of turn.