Magatsu (Errata)

You may pay 6 life instead of {3} to cast Magatsu, Khan of Oblivion. It enters the battlefield with an extra
turn of summoning sickness for every 4 life spent to cast it and cannot gain Haste.
Menace, Deathtouch, Toxic 4, Devoid
If a permanent would enter a graveyard during combat, exile it instead. You may cast spells and play lands exiled this way as long as you control Magatsu, Khan of Oblivion. Spells cast this way cost X, where X is the colored part of their mana cost. (X can be 0)