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There are a few other ideal ways to pick up planeswalkers, but since there are so many, the best answer really is to buy singles through a marketplace like TCGplayer

Getting to dome someone for 5 when you cast a Force of Will

Alternatively, Betor, Ancestor's Voice, turns the deck into more of a recursion-focused one, with a way to reliably bring creatures back from the graveyard

It is insanely fast at creating a huge army of angels, gaining life, meanwhile disabling your opponent through a large number of removal spells and wrath effects

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So a Kodama's Reach or Cultivate, a Hour of Promise or similar effect is going to get a bunch of cards