Harnesser of Storms 

Creature — Otter Wizard
$0.25 #8129 0.43 2.1 years
Whenever you cast a noncreature or Otter spell, you may exile the top card of your library. Until end of turn, you may play that card. This ability triggers only once each turn.
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Cards similar to Harnesser of Storms expected a card that isn't here?
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Wiccan, Young Avenger88%
$0.24↓#19579↓0.00↓0.2 years↓
"Whenever you cast a noncreature spell, exile the top card of your library. Until your next end step, you may play that card."
Narset, Enlightened Master78%
$0.45↑#84441.64↑11.9 years↑
"Whenever this card attacks, exile the top four cards of your library. Until end of turn, you may cast noncreature spells from among those cards without paying their mana costs."
Count on Luck76%
$0.46↑#4287↑0.21↓1.6 years
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
Cleon, Merry Champion75%
$0.30↑#18500↓0.14↓1.8 years
"Whenever you cast a spell that targets this card, exile the top card of your library. You may play that card until the end of your next turn."
Superior Foes of Spider-Man75%
$0.15↓#15355↓0.431.0 years↓
"Whenever you cast a spell with mana value 4 or greater, you may exile the top card of your library. If you do, you may play that card until you exile another card with this creature."
Abbot of Keral Keep75%
$0.17↓#17062↓0.09↓11.1 years↑
"When this creature enters, exile the top card of your library. Until end of turn, you may play that card."
Stella Lee, Wild Card72%
$5.23↑#4954↑0.98↑2.4 years
"Whenever you cast your second spell each turn, exile the top card of your library. Until the end of your next turn, you may play that card."
Emberheart Challenger71%
$0.97↑#89830.65↑2.1 years
"Whenever this creature becomes the target of a spell or ability you control for the first time each turn, exile the top card of your library. Until end of turn, you may play that card."
Armory Paladin70%
$0.34↑#83070.332.5 years
"Whenever you cast an Aura or Equipment spell, exile the top card of your library. You may play that card until the end of your next turn."
Endrider Spikespitter70%
$0.14↓#18578↓0.06↓1.6 years
"Max speed — At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."