Axcellok, Keeper of Valhalla

Flying, trample, lifelink, hexproof
When Axcellok enters the battlefield choose
target player. That player searches their library
for a creature with the greatest power and
toughness of all the creatures in their library,
then they play that card without paying it's mana
cost. Then, restart the game with you and the
chosen opponent with Axcellok and your
opponent's chosen creature on the battlefield
under their owners' control.