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Retrieved September 9, 2020

You can only use each of the following effects of "Armed Dragon Thunder LV7" once per turn

UR (PR) Ultra Rare (Pharaoh's Rare) Mirror Force X TRAP When an opponent's monster declares an attack: Destroy all your opponent's Attack Position monsters

This is known as 'CABS' theory, a term coined by popular Magic podcast Limited Resources

This can come back pretty cheaply, and Black/Red (which likes spells) and Black/Green (which likes the graveyard) can probably take advantage of it

They take up so much sideboard space for a relatively narrow effect that you have to really ask yourself if its worth it at all compared to addressing the real problems with Omni-Tell