Goliath Daydreamer 
Creature — Giant Wizard
$0.26 #9597 0.15 0.7 years
Whenever you cast an instant or sorcery spell from your hand, exile that card with a dream counter on it instead of putting it into your graveyard as it resolves.
Whenever this creature attacks, you may cast a spell from among cards you own in exile with dream counters on them without paying its mana cost.
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Gandalf of the Secret Fire76%
$4.97↑#13170↓0.75↑3.0 years↑
"Whenever you cast an instant or sorcery spell from your hand during an opponent's turn, exile that card with three time counters on it instead of putting it into your graveyard as it resolves. Then if the exiled card doesn't have suspend, it gains suspend."
Zethi, Arcane Blademaster75%
$3.13↑#11525↓0.224.7 years↑
"Whenever this card attacks, copy each exiled card you own with a kick counter on it. You may cast the copies."
Lilah, Undefeated Slickshot74%
$0.28↑#106670.192.5 years↑
"Whenever you cast a multicolored instant or sorcery spell from your hand, exile that spell instead of putting it into your graveyard as it resolves. If you do, it becomes plotted."
The Dragon-Kami Reborn // Dragon-Kami's Egg74%
$0.20↓#16871↓0.054.7 years↑
"Whenever this creature or a Dragon you control dies, you may cast a creature spell from among cards you own in exile with hatching counters on them without paying its mana cost."
Smirking Spelljacker73%
$2.95↑#7114↑0.31↑2.5 years↑
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Zaffai and the Tempests73%
$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."
Kess, Dissident Mage72%
$3.67↑#3198↑0.44↑9.2 years↑
"Once during each of your turns, you may cast an instant or sorcery spell from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead."
Narset, Enlightened Master72%
$0.42↑#86391.15↑12.1 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."
Jeleva, Nephalia's Scourge72%
$3.25↑#14172↓0.33↑13.0 years↑
"Whenever this card attacks, you may cast an instant or sorcery spell from among cards exiled with this card without paying its mana cost."
Surtland Elementalist72%
$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."
Izzet Chemister72%
$0.22↓#13570↓0.199.2 years↑
", 
: Exile target instant or sorcery card from your graveyard."
, : Exile target instant or sorcery card from your graveyard."+1 more matching line
Efreet Flamepainter72%
$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."
The Dawning Archaic71%
$1.01↑#80440.28↑0.5 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."
Diviner of Mist71%
$0.23↓#86520.141.5 years
"Whenever this creature attacks, mill four cards. You may cast an instant or sorcery spell from your graveyard with mana value 4 or less without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
River Song's Diary70%
$0.52↑#6192↑0.26↑3.0 years↑
"Whenever a player casts an instant or sorcery spell from their hand, exile it instead of putting it into a graveyard as it resolves."
+1 more matching line
Wishing Well70%
$0.28↑#114680.112.2 years↑
": Put a coin counter on this artifact. When you do, you may cast target instant or sorcery card with mana value equal to the number of coin counters on this artifact from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead. Activate only as a sorcery."
: Put a coin counter on this artifact. When you do, you may cast target instant or sorcery card with mana value equal to the number of coin counters on this artifact from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead. Activate only as a sorcery."
Dauthi Voidwalker70%
$3.85↑#395↑1.39↑5.5 years↑
", Sacrifice this creature: Choose an exiled card an opponent owns with a void counter on it. You may play it this turn without paying its mana cost."
, Sacrifice this creature: Choose an exiled card an opponent owns with a void counter on it. You may play it this turn without paying its mana cost."
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."
Etali, Primal Storm70%
$0.45↑#281↑0.88↑8.8 years↑
"Whenever this card attacks, exile the top card of each player's library, then you may cast any number of spells from among those cards without paying their mana costs."
Sins of the Past70%
$0.46↑#22839↓0.0621.0 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."