Esurient Garden

You may sacrifice an Insect when Esurient Garden enters the battlefield. If you don't, Esurient Garden enters the battlefield tapped.
{t}: Add {g} to your mana pool.
{t}, Sacrifice an Insect: Add sacrificed Insect's
mana cost to your mana pool.
"It's not a food-chain; it's a free-for-all."