Barbarian King

+2: Barbarian King becomes a 20/20 human warrior that has protection from all damage and is still a planeswalker until end of turn.
-4: The human warrior gets +15+15 for each time you do this, and you summon 2 more Barbarian tokens each time you do this.
-10: Barbarian King regains 5 loyalty and the warrior gets +5+3 until end of turn. Create 5 6/3 Barbarian tokens.