Magmatron, Predacon General

Trample, Vigilance, Triple-strike (It deals first-strike damage, regular combat damage, and damage in between both steps.)
Ward - sacrifice a nontoken artifact or enchantment, tap a creature you control, and lose 3 life.
Whenever Magmatron enters or attacks, choose one that hasn't been chosen:
* Return all artifacts in your opponents graveyards to the battlefield under your control.
* Tap all creatures you do not control.
* Magmatron deals damage to each opponent equal to the number of cards in y