Creature tokens you control get +1/+1 and have vigilance.

Create a 3/3 green Centaur creature token.

{2}{G}, Sacrifice this creature: Create a 3/3 green Centaur creature token.

If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead. If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead.

At the beginning of your upkeep, populate. (Create a token that's a copy of a creature token you control.)

{4}{G}{W}: Create a 3/3 green Centaur creature token. {2}{G}{W}: Populate. (Create a token that's a copy of a creature token you control.)

Whenever an opponent casts a spell during your turn and when this creature dies, create a green and white Elemental creature token with "This token's power and toughness are each equal to the number of creatures you control."

Populate. (Create a token that's a copy of a creature token you control.)

({T}: Add {G}.)

{T}: Add {C}. {3}{G}{W}, {T}, Tap two untapped creatures you control, Sacrifice this land: Create an 8/8 green and white Elemental creature token with vigilance.

({T}: Add {W}.)

This land enters tapped. {T}: Add {G} or {W}.