The Weatherseed Treaty
Enchantment - Saga
(CMC 3)
Read ahead (Choose a chapter and start with that many lore counters. Add one after your draw step. Skipped chapters don't trigger. Sacrifice after III.)
I -- Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
II -- Create a 1/1 green Saproling creature token.
III -- Domain -- Target creature you control gets +X/+X and gains trample until end of turn, where X is the number of basic land types among lands you control.