Tupper, Appalachian Explorer

Tupper, Appalachian Explorer costs {1} less to cast for each mountain or forest you control. He enters the battlefield with 4 insulin counters.
Diabetic (This creature's power and toughness are each equal to the number of insulin counters it has. When this creature enters combat, remove 1 insulin counter.)
{2} Sacrifice a creature or food token: put +1 insulin counter on Tupper.