Demeter, God of the Harvest

Indestructible, Defender
Whenever a land you control is tapped for mana,
add one mana of its color to your mana pool.
{2}{g}{g}{g}{g}: Target land you control becomes a
3/3 green elemental creature with indestructible
until end of turn. It's still a land.
{6}{g}{g}{g}{g}: Gain life equal to the number
of lands you control.