Undergrowth Monument

Undergrowth Monument enters the battlefield
tapped. Black and Green creatures you control
gain +0/+1 as long as Undergrowth Monument
is untapped.
{t}: Add {b} or {g} to your mana pool,
Undergrowth Monument deals 1 damage to you.
"The Monuments emitted an aura of peace. The creatures never attacked us there."
- Allavale City Veteran