Gideon of the Trials (14)

: Until your next turn, prevent all damage target permanent would deal.
: Until end of turn, Gideon becomes a 4/4 Human Soldier creature with indestructible that's still a planeswalker. Prevent all damage that would be dealt to him this turn.
: You get an emblem with "As long as you control a Gideon planeswalker, you can't lose the game and your opponents can't win the game."