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Counters, effects, and damage marked on the object remain with it, even if they are meaningless to the new card type

And right after that, Terra can revive her

Morska, Undersea Sleuth A disillusioned former Simic researcher, Morska is now the pre-eminent deepwater detective of the Ravnican Agency of Magicological Investigations

Because the mana symbol is there in the text, this card has a Blue and Green color identity which precludes it from decks that don't have Blue in their identity

When Spell Queller leaves the battlefield, the exiled cards owner may cast that card without paying its mana cost

The Valkyries acknowledged his bravery and courage and named him the guardian of Istfell