Delvefall
Hermit of the Natterknolls // Lone Wolf of the Natterknolls

Hermit of the Natterknolls // Lone Wolf of the Natterknolls

Creature — Human Werewolf // Creature — Werewolf

Whenever an opponent casts a spell during your turn, draw a card.
At the beginning of each upkeep, if no spells were cast last turn, transform this creature.
Whenever an opponent casts a spell during your turn, draw two cards.
At the beginning of each upkeep, if a player cast two or more spells last turn, transform this creature.

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Cards that do something similar expected a card that isn't here?

Mangara, the Diplomat
Mangara, the Diplomat 96%
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Kraum, Ludevic's Opus
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Rhystic Study
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Nezahal, Primal Tide
Nezahal, Primal Tide 93%
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"Whenever an opponent casts a noncreature spell, draw a card."
Ghostly Pilferer
Ghostly Pilferer 92%
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"Whenever an opponent casts a spell from anywhere other than their hand, draw a card."
Wavebreak Hippocamp
Wavebreak Hippocamp 92%
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"Whenever you cast your first spell during each opponent's turn, draw a card."
Esper Sentinel
Esper Sentinel 89%
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"Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays {X}, where X is this creature's power."
Insight
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"Whenever an opponent casts a green spell, you draw a card."
Mystic Remora
Mystic Remora 86%
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"Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays {4}."
Faerie Mastermind
Faerie Mastermind 85%
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"Whenever an opponent draws their second card each turn, you draw a card."
Forced Fruition
Forced Fruition 84%
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"Whenever an opponent casts a spell, that player draws seven cards."
Lu Xun, Scholar General
Lu Xun, Scholar General 83%
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"Whenever this card deals damage to an opponent, you may draw a card."
River Kelpie
River Kelpie 83%
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"Whenever a player casts a spell from a graveyard, draw a card."
Glademuse
Glademuse 83%
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"Whenever a player casts a spell, if it's not their turn, that player draws a card."
Aerial Extortionist
Aerial Extortionist 82%
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"Whenever another player casts a spell from anywhere other than their hand, draw a card."
Pollywog Prodigy
Pollywog Prodigy 81%
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"Whenever an opponent casts a noncreature spell with mana value less than this creature's power, draw a card."
+1 more matching line
Reparations
Reparations 81%
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"Whenever an opponent casts a spell that targets you or a creature you control, you may draw a card."
Multani's Presence
Multani's Presence 81%
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"Whenever a spell you've cast is countered, draw a card."
Narset, Parter of Veils
Narset, Parter of Veils 81%
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"Each opponent can't draw more than one card each turn."
Alania, Divergent Storm
Alania, Divergent Storm 81%
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"Whenever you cast a spell, if it's the first instant spell, the first sorcery spell, or the first Otter spell other than this card you've cast this turn, you may have target opponent draw a card. If you do, copy that spell. You may choose new targets for the copy."