Cosmic Sovereign

Creature — Dragon — {3}{R}{R}

Flying, Haste
{R}: This creature gets +1/+0 until end of turn.
At the beginning of combat on your turn, conjure a random creature card with mana value X onto the battlefield, where X is this creature's power. That creature gains haste. Exile it at the beginning of the next end step.

Rarity: mythic