When a unit has both Zhonya's Hourglass on board and Guardian Angel equipped, and that unit dies in combat, what happens?

Ruling: As the controlling player, you choose which replacement effect to apply. If you choose Guardian Angel, it is killed instead and the unit is healed, exhausted, and recalled (Zhonya's doesn't trigger). If you choose Zhonya's, the unit is recalled exhausted (Guardian Angel doesn't trigger).

Sequence: If Guardian Angel is chosen:

• The unit takes lethal damage and would die during Cleanup
• Guardian Angel's replacement effect applies: Guardian Angel is killed instead
• Guardian Angel goes to trash
• The unit is healed, exhausted, and recalled to base
• Zhonya's Hourglass does not trigger since the unit never died

If Zhonya's is chosen:

• The unit takes lethal damage and would die during Cleanup
• Zhonya's replacement effect applies: the unit is recalled exhausted
• Guardian Angel does not trigger since the unit never died
• Guardian Angel remains equipped to the recalled unit

Nuances:

• When multiple replacement effects have the same trigger condition, the controlling player chooses which one to apply first
• Once one replacement effect resolves and prevents the death, the other replacement effect no longer has a valid trigger condition
• Guardian Angel's effect kills the gear itself, redirecting the death to the equipment rather than preventing it entirely