Gaea, Mother of Life

Vigilance, Indestructible, Exempt (This creature cannot be exiled)
Creatures' abilities you control that costs life will be change to mana instead.(If the ability costs 7 Life, pay 7 mana instead)
{t} : Target creatures you control gets a +1/+1 counter for each tapped basic land you control.(You can only activate this ability if you can cast a sorcery.)