Indian Coral

When Indian Coral enters the battlefield, create a
revive fragment token artifact with "If more than
5 revive fragments are on the battlefield, you may
pay {g}{g}{g} to revive target coral. You may pay
{g} for each spell you cast this turn."
At the beginning of your upkeep, you may choose
to pay {g}. If you do so, create a revive fragment.