Infested Roots

When Infested Roots enters the battlefield, create
X 1/1 black and green Pest creatures token with
"When this creature dies, you gain 1 life." where
X is equal to the number of Forests and Swamps
you control.
Enchanted land has "{t}: you gain 1 life. Use
this only if a Forest or Swamp has entered the
battlefield this turn."
"Life begets life"