Like most Magic: The Gathering cards, the value of Boon of the Wish-Giver depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Ikoria: Lair of Behemoths)
They're a bit more, again, niche
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But heres the trick: since you know Birdcage is coming, you can build your deck to dodge its downside
