Regal Behemoth 
Creature — Dinosaur
$0.60 #2456 0.43 10.1 years
Trample
When this creature enters, you become the monarch.
Whenever you tap a land for mana while you're the monarch, add an additional one mana of any color.
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Cards similar to Regal Behemoth expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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"When this creature enters, you become the monarch."
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"When this card enters, you become the monarch."
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"When this creature enters, you become the monarch."
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"When this creature enters, you become the monarch."
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"When this enchantment enters, you become the monarch."
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"When this enchantment enters, you become the monarch."
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"Whenever you tap a land for mana, add one mana of any type that land produced."
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"When this creature enters, you become the monarch."
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"Whenever you tap a land for mana, add one mana of any type that land produced."
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"When this card enters, you become the monarch."