Mnemonic Betrayal 
Sorcery
$7.30 #2540 0.49 8.0 years
Exile all opponents' graveyards. You may cast spells from among those cards this turn, and mana of any type can be spent to cast them. At the beginning of the next end step, if any of those cards remain exiled, return them to their owners' graveyards.
Exile Mnemonic Betrayal.
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Cards similar to Mnemonic Betrayal expected a card that isn't here?
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Psionic Ritual79%
$0.32↓#10367↓0.24↓4.4 years↓
"Exile this card."
Morningtide's Light78%
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"Exile this card."
Author of Shadows78%
$0.59↓#13253↓0.06↓5.5 years↓
"When this creature enters, exile all opponents' graveyards. Choose a nonland card exiled this way. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell."
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$0.37↓#18862↓0.29↓5.5 years↓
"Exile this card."
Sheoldred's Restoration78%
$0.20↓#22033↓0.25↓4.1 years↓
"Exile this card."
Shadow of the Enemy77%
$1.05↓#10387↓0.84↑3.3 years↓
"Exile all creature cards from target player's graveyard. You may cast spells from among those cards for as long as they remain exiled, and mana of any type can be spent to cast them."
Avatar's Wrath76%
$4.36↓#1529↑1.25↑0.9 years↓
"Exile this card."
Uncle's Musings76%
$0.46↓#18016↓0.05↓0.9 years↓
"Exile this card."
Covetous Urge76%
$0.07↓#17653↓0.31↓7.0 years
"Target opponent reveals their hand. You choose a nonland card from that player's graveyard or hand and exile it. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell."
Alchemist's Gambit76%
$0.35↓#10619↓0.24↓4.9 years↓
"Exile this card."
Vengeful Rebirth76%
$0.14↓#21928↓0.06↓17.5 years↑
"Exile this card."
Divergent Equation74%
$0.25↓#11442↓0.10↓0.5 years↓
"Exile this card."
Psychic Intrusion72%
$0.19↓#22709↓0.83↑13.1 years↑
"Target opponent reveals their hand. You choose a nonland card from that player's graveyard or hand and exile it. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell."
Deliver Unto Evil71%
$0.29↓#13869↓0.12↓7.5 years
"Exile this card."
Travel Through Caradhras70%
$0.22↓#12708↓0.24↓3.3 years↓
"Exile this card."
Rise of the Eldrazi70%
$22.64↑#21511.30↑3.2 years↓
"Exile this card."
Turtles in Time70%
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Wisdom of Ages70%
$0.30↓#6094↓0.400.5 years↓
"Exile this card."
Flamescroll Celebrant // Revel in Silence70%
$0.32↓#11852↓0.33↓5.5 years↓
"Exile this card."
Finale of Revelation70%
$0.42↓#1330↑0.29↓7.5 years
"Exile this card."