Ioma, The Chaos Orb

Ioma, The Chaos Orb enters the battlefield with
5 time counters on it.
{b}{t}, Remove a time counter, discard a card.
{r}{t}, Remove a time counter, deal 1 damage
to a creature you control.
{g}{t}, Remove a time counter, put a -1/-1 counter on target creature you control.
When there are no time counters left on Ioma,
The Orb of Chaos; destroy all permanents.