Everhaven, Isle of Tranquility

Everhaven, Isle of Tranquility enters the battlefield tapped.
When Everhaven enters the battlefield, you
may exile a card from your hand.
{t}: Add one mana of any color of cards
exiled with Everhaven, Isle of Tranquility.
{t}, Exile Everhaven, Isle of Tranquility: Put target card you own in exile into your hand.