MTG Treachery

You pay all costs and follow all normal timing rules for spells cast and lands played using the permission granted by The Lich Queen’s last ability.
If an instant or sorcery card you cast this way is countered, it will be exiled.
If an instant or sorcery card you cast this way goes to a zone other than exile or a graveyard, perhaps because one of its abilities says to put it into its owner’s hand, it won’t be exiled. This is true even if that same card would be put into a graveyard later in the turn.
Finality counters work on any permanent, not only creatures. If a permanent with a finality counter on it would be put into a graveyard from the battlefield, exile it instead.

Finality counters don’t stop permanents from going to zones other than the graveyard from the battlefield. For example, if a permanent with a finality counter on it would be put into its owner’s hand from the battlefield, it does so normally.
Finality counters aren’t keyword counters, and a finality counter doesn’t give any abilities to the permanent it’s on. If that permanent loses its abilities and then would go to a graveyard, it will still be exiled instead.
Multiple finality counters on a single permanent are redundant.
Counters on identity cards cannot be proliferated because identity cards aren’t permanents.