Gideon of the Trials

+1: Until your next turn, prevent all damage target permanent would deal.
0: Until end of turn Gideon of the Trials becomes a 4/4 Human Soldier creature with indestructible and vigilance that's still plansewalker.
0: You get an emblem with "As long as you control a Gideon plansewalker, you can't lose the game and your opponents can't win the game."