Wavebreak Hippocamp 

Enchantment Creature — Horse Fish
Whenever you cast your first spell during each opponent's turn, draw a card.
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Cards that do something similar expected a card that isn't here?
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Hermit of the Natterknolls // Lone Wolf of the Natterknolls 92%
$0.29#11973
"Whenever an opponent casts a spell during your turn, draw a card."
Mangara, the Diplomat 92%
$0.25#616
"Whenever an opponent casts their second spell each turn, draw a card."
Kraum, Ludevic's Opus 92%
#6811
"Whenever an opponent casts their second spell each turn, draw a card."
Esper Sentinel 88%
$56.22#76
"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."
Ghostly Pilferer 88%
$3.49#1404
"Whenever an opponent casts a spell from anywhere other than their hand, draw a card."
Rhystic Study 88%
$70.26#44
"Whenever an opponent casts a spell, you may draw a card unless that player pays {1}."
Valeria Richards, Precocious 87%
$1.68#16199
"Whenever you cast your first noncreature spell each turn, draw a card."
Faerie Mastermind 85%
$10.74#317
"Whenever an opponent draws their second card each turn, you draw a card."
Glademuse 83%
$0.29#15396
"Whenever a player casts a spell, if it's not their turn, that player draws a card."