Mnemonic Betrayal — ruling 1

You can’t play land cards exiled this way.

Mnemonic Betrayal — ruling 2

Mnemonic Betrayal doesn’t change when you can cast the exiled cards. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty.

Mnemonic Betrayal — ruling 3

If you cast a spell this way and that card is exiled, it’s considered a new object. Mnemonic Betrayal no longer allows you to cast it. It remains in exile when Mnemonic Betrayal’s delayed triggered ability resolves.

Mnemonic Betrayal — ruling 4

Only the cards that remain in exile are returned to their owners’ graveyards. For example, a permanent spell cast this way will remain on the battlefield.

Mnemonic Betrayal — ruling 5

In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, any spells or permanents you control from Mnemonic Betrayal’s effect are exiled. If you leave the game before Mnemonic Betrayal’s delayed triggered ability resolves, the cards remain exiled.

Mnemonic Betrayal : règles, fonctionnement et interactions (MTG)

Mnemonic Betrayal is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

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.

How it works : Mnemonic Betrayal

Original English text — Wizards of the Coast / Scryfall

#1October 5, 2018· Wizards of the Coast
You can’t play land cards exiled this way.
No other card is named in this ruling.
#2October 5, 2018· Wizards of the Coast
Mnemonic Betrayal doesn’t change when you can cast the exiled cards. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty.
No other card is named in this ruling.
#3October 5, 2018· Wizards of the Coast
If you cast a spell this way and that card is exiled, it’s considered a new object. Mnemonic Betrayal no longer allows you to cast it. It remains in exile when Mnemonic Betrayal’s delayed triggered ability resolves.
No other card is named in this ruling.
#4October 5, 2018· Wizards of the Coast
Only the cards that remain in exile are returned to their owners’ graveyards. For example, a permanent spell cast this way will remain on the battlefield.
No other card is named in this ruling.
#5October 5, 2018· Wizards of the Coast
In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, any spells or permanents you control from Mnemonic Betrayal’s effect are exiled. If you leave the game before Mnemonic Betrayal’s delayed triggered ability resolves, the cards remain exiled.
No other card is named in this ruling.