Pollywog Prodigy {1}{U}
Creature — Frog Wizard
Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)
Whenever an opponent casts a noncreature spell with mana value less than this creature's power, draw a card.
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Cards that do something similar expected a card that isn't here?
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Esper Sentinel 89%
$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."
Heartwood Storyteller 84%
$4.35#4079
"Whenever a player casts a noncreature spell, each of that player's opponents may draw a card."
Hermit of the Natterknolls // Lone Wolf of the Natterknolls 81%
$0.29#11973
"Whenever an opponent casts a spell during your turn, draw a card."
Mangara, the Diplomat 80%
$0.25#616
"Whenever an opponent casts their second spell each turn, draw a card."
Kraum, Ludevic's Opus 80%
#6811
"Whenever an opponent casts their second spell each turn, draw a card."
Ghostly Pilferer 80%
$3.49#1404
"Whenever an opponent casts a spell from anywhere other than their hand, draw a card."
Jeskai Ascendancy 80%
$1.36#2926
"Whenever you cast a noncreature spell, you may draw a card. If you do, discard a card."
Wavebreak Hippocamp 80%
$0.83#2329
"Whenever you cast your first spell during each opponent's turn, draw a card."