Mirko, Obsessive Theorist wwk When Krenko's Buzzcrusher enters the

When Krenko's Buzzcrusher enters the battlefield

{T}: The next spell you cast this turn of the chosen type can be cast without paying its mana cost

if you control three or more artifacts

When Enigma Sphinx is put into your graveyard from the battlefield

Mizzium Tank becomes an artifact creature and gets +1/+1 until end of turn

Mirko, Obsessive Theorist wwk When Krenko's Buzzcrusher enters theFlying, vigilance Whenever you surveil, put a +1 +1 counter on Mirko, Obsessive Theorist. At the beginning of your end step, you may return target creature card with power less than Mirko's from your graveyard to the battlefield with a finality counter on it. (If it would die, exile it instead.)