If I have 2 Guardian Angels equipped to 1 unit and it dies, do both Guardian Angels get burned to recall my unit?
No, both Guardian Angel gears are not destroyed. Only one Guardian Angel will be destroyed when the unit would die.
According to the RiftJudge FAQ #1622 and FAQ #9026:
- 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 Application: When the unit would die, you choose one of the Guardian Angel gears to apply its replacement effect. Once that effect resolves, the unit is healed, exhausted, and recalled to your base.
- Death Prevented: Because the unit is recalled to the base, it never actually "dies." Since the death event has been prevented, the second Guardian Angel's trigger condition is no longer met, and it remains attached to the unit in your base.
This interaction is consistent with the rule that you can only replace the same death event once.