If I have 2 Guardian Angels attached to the same unit, do both GAs trigger and both items die?
No, both Guardian Angels do not trigger, and only one is destroyed.
According to RiftJudge FAQ #1622, when a unit with multiple Guardian Angels equipped would die, only one Guardian Angel will be destroyed because only one can replace the dying event.
Why this happens:
- Replacement Effect: Guardian Angel functions as a replacement effect. When the unit would die, the effect replaces that "death" event with "kill this Guardian Angel instead."
- Single Event: Once the first Guardian Angel replaces the death event, the unit is saved, healed, and recalled to your base. Because the unit no longer "dies," the second Guardian Angel no longer has a valid event to replace.
- Controller Choice: If you have multiple replacement effects that could apply to the same event (such as two Guardian Angels), you, as the controller, choose which one to apply first. Once that effect resolves and prevents the death, the other effect(s) cannot trigger.
This interaction is consistent with how other replacement effects, such as Zhonya's Hourglass, function in Riftbound.