Trinity, Xenobotanist Overseer

When this card enters the field under your
control, you can play a Biome card from your Netherworld. It enters the field tapped if you do.
{t}: Add one supply of any color.
{2}{r}: This card's base attack and defense become
3/3, it becomes an Officer in addition to its other
types and it gains Rally 1 and "Eternal Empire
Being cards in your hand cost {1} less to
play."