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Your opponent will have to be in a very good position in terms of creatures and available mana to be able to attack you without losing at least some amount of life

When it comes into play you create a Clue token, which is already a solid way to guarantee a card later in the game

You need a lot of card draw and if you don't have your Exploration you will just end up with too much stuff you can't cast or lay

Alongside generating tokens, Rin and Seri, Inseparable is also an excellent tool for removal and life gain

The fact it's Legendary means it can be a Commander, and if it were going to a Graveyard, it shuffles back into the Library instead, so it's nearly impossible for your opponents to get rid of