Breaching Dragonstorm

#101 - Tarkir: Dragonstorm - [TDM]
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When this enchantment enters, exile cards from the top of your library until you exile a nonland card. You may cast it without paying its mana cost if that spell’s mana value is 8 or less. If you don’t, put that card into your hand.
When a Dragon you control enters, return this enchantment to its owner’s hand.

TDM · EN Danny Schwartz