Rally the Planeswalkers

At the beginning of your upkeep, choose one that
hasn't been chosen, then shuffle your library-
•Search your library for a green planeswalker
card, reveal it, and put it into your hand.
•Search your library for a white planeswalker
card, reveal it, and put it into your hand.
•Search your library for a blue planeswalker
card, reveal it, and put it into your hand.