Zaffai and the Tempests 
Legendary Creature — Human Bard Sorcerer
$0.21 #12086 0.26 0.5 years
Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost.
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Omnispell Adept94%
$0.22↑#19367↓0.00↓8.0 years↑
"
, 
: You may cast an instant or sorcery spell from your hand without paying its mana cost."
, : You may cast an instant or sorcery spell from your hand without paying its mana cost."
Surtland Elementalist83%
$0.58↑#17620↓0.245.7 years↑
"Whenever this creature attacks, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Omniscience83%
$5.87↑#1028↑1.60↑14.3 years↑
"You may cast spells from your hand without paying their mana costs."
Galvanoth83%
$0.31↑#131440.12↓15.7 years↑
"At the beginning of your upkeep, you may look at the top card of your library. You may cast it without paying its mana cost if it's an instant or sorcery spell."
Efreet Flamepainter82%
$0.26↑#15796↓0.00↓5.5 years↑
"Whenever this creature deals combat damage to a player, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Sins of the Past80%
$0.46↑#22839↓0.06↓21.0 years↑
"Until end of turn, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead. Exile this card."
Founding the Third Path79%
$0.26↑#142050.12↓4.1 years↑
"You may cast an instant or sorcery spell with mana value 1 or 2 from your hand without paying its mana cost."
Oracle of Bones79%
$0.27↑#18398↓0.2412.7 years↑
"When this creature enters, if tribute wasn't paid, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Brain in a Jar78%
$0.23↑#18950↓0.00↓10.5 years↑
"
, : Put a charge counter on this artifact, then you may cast an instant or sorcery spell with mana value equal to the number of charge counters on this artifact from your hand without paying its mana cost."
, : Put a charge counter on this artifact, then you may cast an instant or sorcery spell with mana value equal to the number of charge counters on this artifact from your hand without paying its mana cost."
Fluxcharger78%
$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."
Wildfire Eternal78%
$0.26↑#16861↓0.53↑9.3 years↑
"Whenever this creature attacks and isn't blocked, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Daring Waverider78%
$0.20↓#9187↑0.322.2 years↑
"When this creature enters, you may cast target instant or sorcery card with mana value 4 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Goblin Dark-Dwellers77%
$0.26↑#8983↑0.2710.7 years↑
"When this creature enters, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
The Dawning Archaic76%
$1.01↑#8044↑0.280.5 years
"Whenever this card attacks, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Arcane Bombardment76%
$5.23↑#2351↑0.52↑4.5 years↑
"Whenever you cast your first instant or sorcery spell each turn, exile an instant or sorcery card at random from your graveyard. Then copy each card exiled with this enchantment. You may cast any number of the copies without paying their mana costs."
Glamdring76%
$2.27↑#5536↑0.313.3 years↑
"Whenever equipped creature deals combat damage to a player, you may cast an instant or sorcery spell from your hand with mana value less than or equal to that damage without paying its mana cost."
Gandalf, Party Guest76%
$1.60↑#15316↓0.320.2 years
"At the beginning of combat on your turn, you may cast an instant or sorcery spell with mana value X or less from your hand without paying its mana cost, where X is twice the number of legendary Wizards you control."
Skyway Robber75%
$0.30↑#16947↓0.334.5 years↑
"This creature escapes with "Whenever this creature deals combat damage to a player, you may cast an artifact, instant, or sorcery spell from among cards exiled with this creature without paying its mana cost.""
Haunting Figment75%
$0.05↓#24780↓0.13↓4.1 years↑
"This creature can't be blocked as long as you've cast an instant or sorcery spell this turn."
Cryptic Pursuit74%
$0.26↑#15917↓0.40↑4.5 years↑
"Whenever you cast an instant or sorcery spell from your hand, manifest the top card of your library."