Maniax, Articifer of the North

Whenever Maniax attacks, corrupt (whenever a creature with corrupt attacks gain control of
target nonlegendary creature with converted
mana cost 4 or less or a legendary artifact creature
with any converted mana cost).
Legendary creature spells you play have corrupt.
At the beginning of your upkeep if you control 5
or more creatures you don't own, draw two cards.