Court of Locthwain {2}{B}{B}
Enchantment
When this enchantment enters, you become the monarch.
At the beginning of your upkeep, exile the top card of target opponent's library. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast it. If you're the monarch, until end of turn, you may cast a spell from among cards exiled with this enchantment without paying its mana cost.
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Cards that do something similar expected a card that isn't here?
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Uvilda, Dean of Perfection // Nassari, Dean of Expression 85%
$0.25#16260
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Stolen Strategy 85%
$0.36#4419
"At the beginning of your upkeep, exile the top card of each opponent's library. Until end of turn, you may cast spells from among those exiled cards, and you may spend mana as though it were mana of any color to cast those spells."
Court of Vantress 100%
$5.85#3087
"When this enchantment enters, you become the monarch."
+1 more matching line