{R} Sunbird's Invocation [Bloomburrow Commander][BLC 116]

Title
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Set: Bloomburrow Commander
Type: Enchantment
Rarity: Rare
Cost: {5}{R}
Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost. Put the rest on the bottom of your library in a random order.