Amrit, Druid in Exile

Eminence -- Whenever you cast another Druid spell, if Amrit, Druid in Exile is in the command zone or on the battlefield, add one mana of any colour to your mana pool.
When Amrit enters the battlefield, return all
non-Druid creatures to their owners' hands.
Whenever you activate a mana ability of a creature, target creature gets -1/-1 until end of turn.