Deck Knight
Blast Off At The Speed Of Light! That's Right!
I'm generally opposed to Magic Guard on the same premise as Simple.
Magic Guard's biggest unnoticed effect is it even removes Life Orb recoil. Firing off Life Orb Outrages and Draco Meteors and getting 30% more damage for free is insane (or even completely recoil-free Volt Tackles!). Add to that it can come in as a Late Game sweeper and take zero damage from Spikes, Stealth Rock, Sandstorm, Hail, and Toxic Spikes (and in fact, prevent its own burn and paralysis in such a scenario) is mindblowingly powerful. I'd rather not have to sacrifice Outrage, Volt Tackle, and Draco Meteor just out of pure fear of what a late-game LO Sweeper with Magic Guard could do with them.
If you want to avoid imbalance, I'd recommend against Magic Guard.
Magic Guard's biggest unnoticed effect is it even removes Life Orb recoil. Firing off Life Orb Outrages and Draco Meteors and getting 30% more damage for free is insane (or even completely recoil-free Volt Tackles!). Add to that it can come in as a Late Game sweeper and take zero damage from Spikes, Stealth Rock, Sandstorm, Hail, and Toxic Spikes (and in fact, prevent its own burn and paralysis in such a scenario) is mindblowingly powerful. I'd rather not have to sacrifice Outrage, Volt Tackle, and Draco Meteor just out of pure fear of what a late-game LO Sweeper with Magic Guard could do with them.
If you want to avoid imbalance, I'd recommend against Magic Guard.