Monitor Monitor

If you roll multiple dice at the same time, paying {1} will let you reroll any number of those dice. You don’t have to pay {1} per die.

If you control multiple Monitor Monitors, you may use each of them once each turn. You may use multiple Monitor Monitors on the same die roll if you wish.

You decide whether to use Monitor Monitor’s ability right after you monitor the result of the die roll. You can’t wait and use it to reroll that die later.