Lex Luthur,LexCorp Warsuit

Artifacts cost zero mana to cast
{2}Lex Luthur has flying until end of turn.
{g}{4} create a Krypnonite artifact with "target a Kryptonian under your opponent's control,
sacrifice Kryptonite,
target Kryptonian is now a 1/1 and doesn't have indestructible."