Sylvan Transformation

Pact - Sacrifice another artifact or enchantment.
(At the beginning of your upkeep, pay this permanent's
pact cost. If you can't, sacrifice this permanent.)
Whenever a land enters the battlefield under
your control, you gain 3 life, create a 3/3 green
Beast creature token, and add {g}{g}.
"It is time that civilization knows what is truly
eternal."