One'mrakul, Seed-Sower

Flying, menace, haste
When One'mrakul enters the battlefield, gain control of target creature. It becomes an Eldrazi in addition to its other types. Untap it. It gains haste until end of turn.
At the beginning of your upkeep, search your library for a creature with converted mana cost equal to or less than the number of Eldrazi you control. Put it onto the battlefield, it becomes an Eldrazi in addition to its other types.