Teyo, Shieldmage

+5: You get an emblem with "Creatures you control have defender, indestructible, and have +5/+10." You can only activate this ability once.
-X: Create a X/X white Wall creature token with defender. Whenever it deals damage, put that many loyalty counters on Teyo, Shieldmage.
-15: Create a 20/20 white Wall creature token with defender. At the beginning of your next turn, creatures you control lose defender.