Gildarts - Gideon "Oath"

: Whenever you attack with two or more non-Gideon creatures, put a +1/+1 counter on each of those creatures.
+2: Until end of turn, Gildarts becomes a 5/5 white Soldier creature that's still a walker. Prevent all damage that would be dealt to him this turn.
-9: Exile Gildarts and each creature your opponents control.