Exhibition Tidecaller 
Creature — Djinn Wizard
$0.41 #8018 0.40 0.5 years
Opus — Whenever you cast an instant or sorcery spell, target player mills three cards. If five or more mana was spent to cast that spell, that player mills ten cards instead.
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Cards similar to Exhibition Tidecaller expected a card that isn't here?
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Tackle Artist86%
$0.18↓#18749↓0.06↓0.5 years
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. If five or more mana was spent to cast that spell, put two +1/+1 counters on this creature instead."
Thunderdrum Soloist86%
$0.29↓#9902↓0.10↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent. If five or more mana was spent to cast that spell, this creature deals 3 damage to each opponent instead."
Deluge Virtuoso83%
$0.09↓#21012↓0.14↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. If five or more mana was spent to cast that spell, this creature gets +2/+2 until end of turn instead."
Aberrant Manawurm82%
$0.16↓#23171↓0.05↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is the amount of mana spent to cast that spell."
Spectacular Skywhale81%
$0.16↓#19016↓0.04↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn. If five or more mana was spent to cast that spell, put three +1/+1 counters on this creature instead."
Glacierwood Siege80%
$0.32↓#5003↑0.411.5 years↑
"• Temur — Whenever you cast an instant or sorcery spell, target player mills four cards."
Muse Seeker78%
$0.22↓#13224↓0.04↓0.5 years
"Whenever you cast an instant or sorcery spell, draw a card. Then discard a card unless five or more mana was spent to cast that spell."
Nightmares and Daydreams76%
$0.20↓#18969↓0.24↓0.9 years
"Until your next turn, whenever you cast an instant or sorcery spell, target player mills cards equal to that spell's mana value."
Expressive Firedancer76%
$0.06↓#22223↓0.08↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. If five or more mana was spent to cast that spell, this creature also gains double strike until end of turn."
Elemental Mascot72%
$0.11↓#20424↓0.08↓0.5 years
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn. If five or more mana was spent to cast that spell, exile the top card of your library. You may play that card until the end of your next turn."
Increasing Confusion70%
$0.93↑#9999↓0.71↑14.7 years↑
"Target player mills X cards. If this spell was cast from a graveyard, that player mills twice that many cards instead."
Smoldering Egg // Ashmouth Dragon70%
$0.38↓#10737↓0.07↓5.1 years↑
"Whenever you cast an instant or sorcery spell, put a number of ember counters on this creature equal to the amount of mana spent to cast that spell. Then if this creature has seven or more ember counters on it, remove them and transform this creature."
Fluxcharger70%
$0.15↓#28428↓0.00↓13.5 years↑
"Whenever you cast an instant or sorcery spell, you may switch this creature's power and toughness until end of turn."