Dreadhorde Arcanist 

Creature — Zombie Wizard
$0.39 #7975 0.11 7.3 years
Trample
Whenever this creature attacks, you may cast target instant or sorcery card with mana value less than or equal to this creature's power from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead.
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Cards similar to Dreadhorde Arcanist expected a card that isn't here?
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Helmut Zemo, Mastermind94%
$0.23↓#18432↓0.00↓0.2 years↓
"Whenever this card attacks, you may cast target instant or sorcery card with mana value less than or equal to his power from your graveyard. If that spell would be put into your graveyard, exile it instead. If you cast a spell this way, put a +1/+1 counter on this card."
Diviner of Mist88%
$0.28↓#86590.211.4 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."
Efreet Flamepainter85%
$0.33↓#15409↓0.135.4 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."
Torrential Gearhulk85%
$0.35↓#2710↑0.51↑9.9 years↑
"When this creature enters, you may cast target instant card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Victor Timely, Wily Tycoon84%
$0.26↓#27392↓0.00↓0.2 years↓
"When this card enters, you may cast target artifact, 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."
Daring Waverider84%
$0.24↓#88810.38↑2.1 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-Dwellers83%
$0.26↓#89450.00↓10.6 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 Archaic82%
$1.19↑#85440.00↓0.4 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."
Chandra, Acolyte of Flame82%
$0.48↑#5957↑0.077.2 years
"−2: You may cast target instant or sorcery card with mana value 3 or less from your graveyard. If that spell would be put into your graveyard, exile it instead."
Impulsivity81%
$0.27↓#6081↑0.00↓0.6 years↓
"When this creature enters, you may cast target instant or sorcery card from a graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Seifer Almasy80%
$0.29↓#10537↓0.181.2 years↓
"Whenever this card deals combat damage to a player, 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."
Ogre Battlecaster80%
$0.22↓#24630↓0.69↑3.8 years↓
"Whenever this creature attacks, you may cast target instant or sorcery card from your graveyard by paying 
in addition to its other costs. If that spell would be put into a graveyard, exile it instead. When you cast that spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value."
Backdraft Hellkite80%
$0.53↑#80120.147.0 years
"Whenever this creature attacks, each instant and sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost."