Care-a-lot Castle

As Care-a-lot Castle enters the battlefield, you
may reveal a Care Bear card from your hand. If
you don't, Care-a-lot Castle enters the battle-
field tapped.
{t}: Add one mana of any color. Spend this
mana only to cast a Care Bear spell.
{t}, sacrifice Care-a-lot Castle: Put any Care
Bear from the graveyard onto the battlefield.