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When Lander enters, create X lander tokens (They're artifacts with ", , Sacrifice this token: Search you library for a basic land card, put it onto the battlefield tapped, then shuffle.)
Landerfall — Whenever a lander you control enters, put a +1/+1 counter on Lander.
, , Sacrifice Lander: Search you library for a basic land card, put it onto the battlefield tapped, then shuffle.