Fungal Mound

Fungal Mound enters the battlefield tapped, unless you have 30 or less life.
{t}: Add {g} or {b} to your mana pool.
{t}: Pay 4 life, add {2} to your mana pool.
Whenever Fungal Mound taps, choose 1:
• Each player gains 1 life.
• Each player loses 1 life.