Hero's Temptation

{t}{c}{c}
When Hero's Temptation enters the battlefield, create an combat ring(A separate combat zone.) Only three creatures can be in the combat ring. At the beginning of your upkeep, choose two creatures at random in the combat ring. Those creatures fight each other. The surviving creature gets a +1/+1 counter.
At the beginning of your upkeep if there aren't three creatures in the combat ring, put one in there at random.