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When it hits an opponent, you exile cards from their library until you hit a nonland, then you can cast that card using your life instead of mana

An exiled permanent loses any counters it had on the battlefield and leaves any Auras or Equipment attached to it behind

Are the cards viable for competitive play

Nantuko Monastery One of the few manlands that let you pay two mana and get a 4/4, the playability of Nantuko Monastery is limited to the formats in which its legal

Of particular interest are the Venom, Doc Ock, Green Goblin, and Spider-Man cards

I also tossed in Maze of Ith so they'll need to attack with two or more and then more will bounce