Old Faithful

Old Faithful enters the battlefield tapped;
unless all mana that was spent to cast this spell
was colorless.
Each time you end turn with colorless
mana floating, put a +1/+1 counter for each:
on Old faithful.
{t}or{ut}: Remove a +1/+1 from Old Faithful.
If a +1/+1 counter is removed, do 1 damage
to any target
(Can only trigger six times in one turn)