If youre facing down lethal damage, it can sometimes be prudent to just wipe the slate clean and start over
Sephiroth on the other hand plays into the usual control strategies favored by Blue/Black by growing in strength for every opposing creature you remove from play
On the play, they might be fine but Id rather keep in a Breath Weapon instead
Decks like Nekusar, the MindrazerNekusar, the Mindrazer, Purphoros, God of the ForgePurphoros, God of the Forge, and other linear combo decks that try to explode on the entire table at once will find it difficult to thrive in a game where diplomacy rules
Later in the game, when you need that huge spell back, you can tap it to return the imprinted card back to your hand
These are NOT available in serialized versions