Goliath Daydreamer 
Creature — Giant Wizard
$0.28 #9800 0.00 0.6 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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Cards similar to Goliath Daydreamer expected a card that isn't here?
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Gandalf of the Secret Fire79%
$5.12↑#13224↓0.10↑2.8 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."
Zaffai and the Tempests78%
$0.23↓#12693↓0.000.4 years
"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Lilah, Undefeated Slickshot77%
$0.29↑#104950.47↑2.4 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."
Narset, Enlightened Master77%
$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."
Pyre Hound76%
$0.07↓#18983↓0.0010.4 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Electrostatic Infantry76%
$0.35↑#6376↑0.28↑4.0 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."
Smirking Spelljacker76%
$1.93↑#6995↑0.47↑2.4 years↑
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Surtland Elementalist76%
$0.24↓#17279↓0.075.6 years↑
"Whenever this creature attacks, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Kess, Dissident Mage75%
$3.80↑#3135↑0.55↑9.0 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."
Fire Urchin75%
$0.07↓#25447↓0.62↑7.9 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Festival Crasher75%
$0.17↓#19995↓0.22↑4.9 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Jeleva, Nephalia's Scourge74%
$2.41↑#14185↓0.59↑12.8 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."
Izzet Chemister74%
$0.21↓#13269↓0.50↑9.0 years↑
", 
: Exile target instant or sorcery card from your graveyard."
, : Exile target instant or sorcery card from your graveyard."+1 more matching line
The Dawning Archaic74%
$1.19↑#85440.000.4 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."
Efreet Flamepainter74%
$0.33↑#15409↓0.13↑5.4 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."
Diviner of Mist74%
$0.28#86590.21↑1.4 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."
Wishing Well74%
$0.22↓#110640.25↑2.1 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."
Kiln Fiend74%
$0.10↓#16947↓0.27↑16.4 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Renegade Bull74%
$0.19↓#14356↓0.000.4 years
"Whenever this creature attacks, exile up to one target instant or sorcery card from your graveyard and copy it. You may cast the copy without paying its mana cost."
+1 more matching line
Fluxcharger74%
$0.10↓#28164↓0.0613.3 years↑
"Whenever you cast an instant or sorcery spell, you may switch this creature's power and toughness until end of turn."