+Worldwake, +"as long as you control" (3)
Loam Lion gets +1/+2 as long as you control a Forest.
As long as you control a Plains, Sejiri Merfolk has first strike and lifelink. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)
As long as you control a Mountain, Summit Apes has menace. (It can't be blocked except by two or more creatures.)
Gatherer works better in the Companion app!