Kytheon, Hero of Akros #13

At end of combat, if Kytheon, Hero of Akros and at least two other creatures attacked this combat, exile Kytheon, then return him to the battlefield transformed under his owner's control. 2W: Kytheon gains indestructible until end of turn.

[+2] :Up to one target creature an opponent controls attacks Gideon, Battle-Forged during its controller's next turn if able. [+1]: Until your next turn, target creature gains indestructible. Untap that creature. [0]: Until end of turn, Gideon, Battle-Forged 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.