Gordax, Mizzium Meddler

This spell cannot be countered
When Gordax, Mizzium Mastermind enters the battlefield, you may discard a card. If you do,
search your library for an artifact, reveal it, play
it immediately without paying it's mana cost,
then shuffle your library.
{x}, {t}: Artifact Creatures you control gain
+X/+X until end of turn