Legendary Artifact
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The triggered ability of Urza's Sylex will resolve before the activated ability. This means that you choose whether to pay 
and search your library before any player chooses lands. Notably, this means that the other players will get to know which planeswalker card you searched for before choosing any lands.
, 
, Exile Urza's Sylex: Each player chooses six lands they control. Destroy all other permanents. Activate only as a sorcery.. If you do, search your library for a planeswalker card, reveal it, put it into your hand, then shuffle.