Boreas Charger
Creature — Pegasus
Oracle Text
Flying When this creature leaves the battlefield, choose an opponent who controls more lands than you. Search your library for a number of Plains cards equal to the difference, reveal those cards, put one of them onto the battlefield tapped and the rest into your hand, then shuffle.Rules for this card
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A keyword ability that restricts how a creature may be blocked. See rule 702.9, “Flying.”
Rulings (2)
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Wizards of the CoastYou can find fewer Plains cards than the difference, perhaps because you don't have that many Plains cards left in your library.
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Wizards of the CoastIf no opponent controls more lands than you, you'll search your library and shuffle it, but you won't be able to find any Plains cards.