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Rules Text

"2""White""White", "Tap", Exile Urza’s Sylex: Each player chooses six lands they control. Destroy all other permanents. Activate only as a sorcery.

When Urza’s Sylex is put into exile from the battlefield, you may pay "2". If you do, search your library for a planeswalker card, reveal it, put it into your hand, then shuffle.