Amelec, Oathbroken Exile

0: Whenever you attack with two or more non-Amelec or non-Gideon creatures, put a +1/+1 counter on each of those creatures.
+2: Until end of turn, Amelec, Oathbroken Exile becomes a 5/5 White Soldier Planeswalker creature. Prevent all damage to him this turn.
-6: Exile Gideon, the Oathsworn and each creature your opponents control.