Mana Orb

When Mana Orb enters the battlefield,
sacrifice an untapped land. If you don't,
sacrifice Mana Orb.
Mana Orb enters with X charge counters on it.
{t}: Add X mana of any one color to your mana
pool, where X is the amount of charge counters
on Mana Orb, then Mana Orb deals X damage
to you.