I was wondering something. Can you us My Body as a Shield on activating card effects like Armed Dragon, Thunder Giant, and Zaborg, the Thunder Monarch?

Yes you can, anything that would destroy 1 or more of your monsters is Shieldable.

Rulings

"My Body as a Shield" will negate cards such as "Dark Hole", "Fissure", "Raigeki", "Eternal Rest", "Nobleman of Crossout", "Tribute to the Doomed", "Thousand Knives", "Trap Hole", "Two-Pronged Attack", "Mirror Force", "House of Adhesive Tape", "Eatgaboon", "Ring of Destruction", "Torrential Tribute", "Bottomless Trap Hole", "Man-Eater Bug", "Blast Juggler", "Dragon Seeker", "Dream Clown", "Throwstone Unit", "Burst Breath", "Swarm of Scarabs", "Cyber Jar", "Tribe-Infecting Virus", "Raigeki Break", "XYZ Dragon Cannon", "Mega-Ton Magical Cannon", "Exiled Force" (negates the effect but will not destroy "Exiled Force" as it is already in the Graveyard), "Offerings to the Doomed" (negates "Offerings to the Doomed" so you do not skip your Draw Phase), "Jowgen the Spiritualist" (when its effect is activated), "Dragon's Gunfire" (if the effect that destroys a monster is selected), or "The Last Warrior From Another Planet" (negates the effect and destroys "The Last Warrior From Another Planet").

"My Body as a Shield" can only be used against effects that will destroy monsters at that time. So you cannot use "My Body as a Shield" when "Tribe-Infecting Virus" is summoned; you can only use it in response to the activation of "Tribe-Infecting Virus"'s effect, at which point the effect of "Tribe-Infecting Virus" is negated and "Tribe-Infecting Virus" is destroyed. Also, you cannot use "My Body as a Shield" against cards whose effects will not destroy a monster right away, so you cannot use "My Body as a Shield" against "Jigen Bakudan", "Ekibyo Drakmord", "Magical Hats", "Steel Scorpion", "Toon Monsters", "Thunder Nyan Nyan", "Gradius' Option", "Summoner of Illusions", "Limiter Removal", "Call of the Haunted", "Premature Burial", or "Autonomous Action Unit".

You cannot use "My Body as a Shield" against cards whose effects might or might not destroy a monster right away, such as "Earthshaker", "Barrel Dragon", "Acid Trap Hole", or "Time Wizard".

You cannot use "My Body as a Shield" against monsters with continuous effects such as "Kotodama" .

You cannot activate "My Body as a Shield" during the Damage Step, so you cannot use it against a "Man-Eater Bug" or "Cyber Jar" flipped by an attack, but you can use it when these monsters are Flip Summoned.

"Judgment of Anubis" may be chained to "My Body as a Shield".

[Re: Embodiment of Apophis] If an effect that destroys Trap Cards is used against "Embodiment of Apophis", you can use "Fake Trap" to prevent it from being destroyed. When preventing the destruction of "Embodiment of Apophis", you must be using a card of the appropriate type. You cannot use "My Body as a Shield" to rescue it from "Heavy Storm". You cannot use "Fake Trap" to rescue it from "Raigeki". You can use "Riryoku Field" when "Embodiment of Apophis" is targeted by "Snatch Steal", but not when it's targeted by "Mystical Space Typhoon". You can use any of these effects to protect "Embodiment of Apophis" from "Raigeki Break" because "Raigeki Break" can destroy a Monster card or a Trap Card.

[Re: Gatling Dragon] You cannot activate "My Body as a Shield" as a chain to "Gatling Dragon" because it has not yet been decided if any monster(s) will be destroyed or not.

[Re: Goldd, Wu-Lord of Dark World] If monsters are targeted by "Goldd, Wu-Lord of Dark World", the opponent can chain "My Body as a Shield".

[Re: Judgment of Anubis] You can activate "Judgment of Anubis" and select a Spell Card that negates the activation of a card and destroys it, like "My Body as a Shield" or "Bait Doll".

[Re: Magical Dimension] You cannot chain "My Body as a Shield" to "Magical Dimension", since destroying a monster on the field is optional.

[Re: Winged Kuriboh LV10] The Multi-Trigger Effect of "Winged Kuriboh LV10"can be chained to. You can chain "Barrel Behind the Door" or "My Body as a Shield" to the effect.


Armed Dragon LV5/LV7/LV10, Zaborg the Thunder Monarch and E. Hero Thunder Giant all fall under the first ruling..