Lord Tirek, Terror Supreme.

Trample
Escape from Tartarus-You may ask an opponent if
one of the creatures in their graveyards wants to
team up with Tirek. If they say yes,
return Tirek and the chosen creature from the graveyard to the battlefield under both players'
controls. (You both may attack and block with
them and use their abilities, Whoever declares
using the creature first gets to)