Leveler

When Leveler enters the battlefield, exile all cards from your library.

Fractured Identity

Exile target nonland permanent. Each player other than its controller creates a token that's a copy of it.

Laboratory Maniac

If you would draw a card while your library has no cards in it, you win the game instead.

Grolnok, the Omnivore

Whenever a Frog you control attacks, mill three cards.
Whenever a permanent card is put into your graveyard from your library, exile it with a croak counter on it.
You may play lands and cast spells from among cards you own in exile with croak counters on them.