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If Leyline of Singularity is in your opening hand, you may begin the game with it on the battlefield.
All nonland permanents are legendary.
@Arcea because of the Dominaria spoiler List. A lot of new mechanics that are based around the legendary rules, like a new mox that you only can use if you control a legendary Permanent.
Another buyout again? But why? I don't see any relevant interaction in any tournament format