It's needed in case a player's main card is put into a library, hand, graveyard, or exile
Unlike other clones, this is technically a card if you dont copy something
Calim, Djinn Emperor Ever since its creation, Calim, Djinn Emperor has been a mainstay of blue control decks, allowing you to cycle it, tap something, and still create a copy of it (conjure) into your deck, which makes your endgame better
The new set brings the iconic characters and settings of Middle-earth to life as MTG cards, including Frodo and Samwise, Aragorn and Arwen, and even the enigmatic Tom Bombadil
The great evil sea witch Ursula from Ursula's Return has been defeated
If a method like that is acceptable, then an Unknown Event card isnt much of a stretch