Magneto, Master of Magnetism

Artifact Convoke - (Your artifacts can help cast this spell. Each artifact you tap while casting this spell pays for {1} or one mana of that artifact's color.)

Flying, Protection from artifacts

Whenever Magneto, Master of Magentism blocks a creature, put an ultimate counter on him. If Magneto, Master of Magnetism has 5 ultimate counters, remove him from the battlefield and return him transformed.