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"Disturb [cost]" means "You may cast this card transformed from your graveyard by paying [cost] rather than its mana cost." When you cast a spell using a card's disturb ability, the card is put onto the stack with its back face up

There are things you can do to manage being mana hosed and mana flood, both in deck building and in gameplay

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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

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