Rule 602.3 · Activating Activated Abilities

Some abilities specify that one of their controller’s opponents does something the controller would normally do while it’s being activated, such as choose a mode or choose targets. In these cases, the opponent does so when the ability’s controller normally would do so.

Subrules

If there is more than one opponent who could make such a choice, the ability’s controller decides which of those opponents will make the choice.

If the ability instructs its controller and another player to do something at the same time as the ability is being activated, the ability’s controller goes first, then the other player. This is an exception to rule 101.4.

Other rules in this chapter

Ask the judge Pro

The life counter has an AI judge that answers your play citing the exact rules. It is part of Gatewatch Pro; the rules, Oracle text and rulings stay free.