Gem-Shard Colossus

Suspend 6 - {3} (Rather than cast this card from your hand, you may pay {3} and exile it with six time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)
Your life total can't change. (You can't gain
or lose life. You can't pay any amount of life except 0.)