Maroo, Ayatan Connoisseur

Protection from artifacts
Metalcraft — As long as you control three or
more artifacts, noncreature artifacts you control
have "{t}: Add {x} in any combination of colors,
where X is half of this card's converted mana
cost. Round up."
{t}, sacrifice an artifact you control: Search your library for an artifact and put it into your hand. Shuffle your library.