Xyz Tribalrivals (AMDE-EN045)

Face-up Xyz Monsters on the field with 2 or more materials cannot be destroyed by card effects. After damage calculation, if your Xyz Monster battled an opponent's monster while this card is already face-up in your Spell & Trap Zone: Destroy that opponent's monster. That Xyz Monster must have 2 or more materials attached to activate and to resolve this effect.

trap / Continuous, Amazing Defenders