When Lander enters, create X lander tokens (They're artifacts with "{2}, {T}, 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.
{2}, {T}, Sacrifice Lander: Search you library for a basic land card, put it onto the battlefield tapped, then shuffle.