Casper

: As long as Casper has seven or more loyalty counters on him, he's a 7/7 Dragon God creature with flying and indestructible.Ignore 2nd ability 4/4
+2: until the end of turn Casper becomes a 4/4 Furry creature with indestructible still a planeswalker. Prevent all damage that would be dealt to him
-10: if Casper has seven or more loyalty counter on him when this is activated, you win the game,