Trial of the Ashen Sky

When Trial of the Ashen Sky enters the battlefield, choose target creature, then put three Trial counters on Trial of the Ashen Sky.
The creature's controller cannot cast creature spells from his or her hand.
At the beginning of your upkeep, remove a Trial counter from Trial of the Ashen Sky. Then, if it has no Trial counters on it, sacrifice it, then put five +1/+1 counters on the chosen creature.