Ikoria's crystals glow in the presence of monsters, making them valuable as both defensive fortifications and warning beacons.

Crystal Barricade

Defender (This creature can't attack.)
You have hexproof. (You can't be the target of spells or abilities your opponents control.)
Prevent all noncombat damage that would be dealt to other creatures you control.

Foundations

Defender
You have hexproof.
Prevent all noncombat damage that would be dealt to other creatures you control.

Foundations Promos

If Crystal Barricade and other creatures you control would be dealt noncombat damage at the same time, the damage that would be dealt to your other creatures is prevented even if the damage being dealt to Crystal Barricade is lethal damage.