Question

Does Magic Guard prevent Life orb damage?

Answer 1

Yes, it does.

Damage caused by entry hazards (such as Spikes) and recoil and crash damage (except from Struggle) is prevented. Magic Guard will also prevent Life Orb's HP deduction without negating its power boost. Damage from confusion still occurs.
-Quoted from Bulpapedia

Source

Comments

That sounds kinda broken considering some of the pokemon that have magic guard.