chasm of sorrow

The chasm of sorrow enters to the batlefield taped, when the chasm of sorrow enters to the batelfield returne a basic land to your hand
Add one {b} and one {g} to your mana pool.
When ever you casta a spell with the conjuration subtype you may pay 2 lifes & {b/g}{b/g}, if do so dobel the numer of token summon.