Lady Loki, Agent of Chaos 

Legendary Creature — God Sorcerer Villain
$0.32 #17262 0.00 0.2 years
Whenever you cast your first instant, sorcery, or Villain spell each turn, exile it, then exile cards from the top of your library until you exile a nonland card. Lady Loki deals damage to each opponent equal to the difference between that spell's mana value and that nonland card's mana value. You may cast that card without paying its mana cost.
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Ensnared by the Mara76%
$7.61↑#3385↑0.48↑2.9 years↑
"Each opponent faces a villainous choice — They exile cards from the top of their library until they exile a nonland card, then you may cast that card without paying its mana cost, or that player exiles the top four cards of their library and this card deals damage equal to the total mana value of those exiled cards to that player."
Wanda's Vision74%
$4.40↑#159290.000.2 years
"Whenever you cast your second spell each turn, exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost."
Chaos Wand73%
$0.25↓#4248↑0.27↑8.1 years↑
"
,
: Target opponent exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then put the exiled cards that weren't cast this way on the bottom of that library in a random order."
Synthesis Pod73%
$0.23↓#156900.52↑3.6 years↑
"
,
, Exile a spell you control: Target opponent reveals cards from the top of their library until they reveal a card with mana value equal to 1 plus the exiled spell's mana value. Exile that card, then that player shuffles. You may cast that exiled card without paying its mana cost."
Shardless Agent73%
$0.34↑#7378↑0.0014.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Bloodbraid Elf73%
$0.15↓#4839↑0.32↑17.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Annoyed Altisaur73%
$0.20↓#3970↑0.21↑5.8 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Enlisted Wurm73%
$0.11↓#188170.44↑17.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Maelstrom Colossus73%
$0.34↑#4503↑0.38↑5.8 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Boarding Party73%
$0.25↓#7817↑0.005.8 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Captured Sunlight72%
$0.12↓#21904↓0.0617.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Guttersnipe72%
$0.22↓#404↑0.43↑13.9 years↑
"Whenever you cast an instant or sorcery spell, this creature deals 2 damage to each opponent."
Dazzling Sphinx72%
$0.37↑#6415↑0.53↑5.4 years↑
"Whenever this creature deals combat damage to a player, that player exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order."
Zaffai and the Tempests72%
$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."
Erebor Flamesmith72%
$0.49↑#2409↑0.19↑3.2 years↑
"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent."
Gríma, Saruman's Footman72%
$1.60↑#3164↑0.36↑3.2 years↑
"Whenever this card deals combat damage to a player, that player exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order."
Meteoric Mace72%
$0.17↓#9329↑0.53↑5.8 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Call Forth the Tempest72%
$24.28↑#1815↑0.49↑2.8 years↑
"Cascade, cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order. Then do it again."
Demonic Dread71%
$0.26↓#20982↓0.29↑17.3 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."