Jayce, Budding Headmaster

+1: For every loyalty counter on Jayce, choose another planeswalker you control and add one loyalty counter to each chosen this way.
-3: Until end of turn, each planeswalker you control becomes an X/X creature, where X is the amount of loyalty counters on that planeswalker.
-10: You get an emblem with "You may activate loyalty abilities of planeswalkers an additional time during your turn."