The First Sliver Hive

Slivers spell you cast cost {3} less to cast.
Sliver creatures you control have +2+2
Whenever you cast a Sliver spell, add
{w}{u}{b}{r}{g} to your mana pool.
this mana does not empty from your mana pool as steps and phases end.
Just when we thought things couldn't get any worse it awakened.