Yes. Kasha's effect to return all monsters to deck is a triggered effect, triggered on special summon. Fiendish Chain can be chained to this, and will resolve first. That means Kasha's trigger will be negated when it tries to resolve, and nothing will be shuffled back into deck. Kasha's ATK will remain at 0.
When the Monarch is tribute summoned, it has a triggered effect that activates. Fiendish Chain can be chained to this. Fiendish Chain will resolve first, meaning the Monarch effect will be negated when it tries to resolve.
Flip Effects are Triggered Effects, so if a player flipped a flip effect monster, the effect will trigger as chain link 1. Fiendish Chain can be chained to it, to negate the effect when it tries to resolve. However, if the monster is flipped by an attack, then the trigger happens during the Damage Step. There are restrictions against what you are allowed to activate during the damage step, and Fiendish Chain can't be used here. So it could not stop a Flip Effect at that time.
You cannot use Royal Command to negate and monster whose effect activates when it is flip summoned, as Royal Command only activates for FLIP: monsters.
Cyber Phoenix will only negate an effect if it targets, and if it targets only 1 monster, which is one of your machine monsters. It would therefore negate Sakuretsu Armor if used against one of your machine monsters. It would not stop Icarus Attack, which targets two monsters. It doesn't matter if it only targets one of your machines, it is still invalid due to targeting two monsters in total.
The Flip Effect itself is a Trigger, an activation of a monster effect. Herald of Perfection cannot negate the summon itself, but can chain to and negate the actual Flip Effect trigger.
When the Monarch is tribute summoned, it has a triggered effect that activates. Fiendish Chain can be chained to this. Fiendish Chain will resolve first, meaning the Monarch effect will be negated when it tries to resolve.
no fiendish chain most certainly does not negate attacks, if the card does not state it negates an attack it does not negate attacks
If a monster activates an effect, then Fiendish Chain can be chained to this. Fiendish Chain will resolve first, meaning the monster's effect will be negated when it tries to resolve. So if Chaos Sorcerer activates his Ignition Effect, Fiendish Chain can be used to negate it.
Yes. Effect Veiler can chain to their activations in the main phase, and Fiendish Chain can chain to them at any time outside the damage step (meaning if they are attacked and flipped, it can't negate them).
The turn player has Priority, so can activate Chaos Sorcerer's effect as chain link 1. Fiendish Chain can be chained to this. Fiendish Chain will resolve first, so Chaos Sorcerer's effect will be negated when it tries to resolve.
Flip Effects are Triggered Effects, so if a player flipped a flip effect monster, the effect will trigger as chain link 1. Fiendish Chain can be chained to it, to negate the effect when it tries to resolve. However, if the monster is flipped by an attack, then the trigger happens during the Damage Step. There are restrictions against what you are allowed to activate during the damage step, and Fiendish Chain can't be used here. So it could not stop a Flip Effect at that time.
No, you either negate the entire effect with Prime Material Dragon or get rid of all of the monsters on the field. You cannot simply choose which monsters gets to be destroyed. You cannot negate an effect midway during its resolution.
Yes it can. 'Des Croaking' is an effect that will destroy monsters on the field, therefore Prime Material Dragon can chain to and negate it.
You cannot use Royal Command to negate and monster whose effect activates when it is flip summoned, as Royal Command only activates for FLIP: monsters.
Prime Material Dragon's effect has to be chained to whatever you want it to negate. So if Dark Hole is activated, it has to chain to it, to negate it. If you allow Dark Hole to resolve, all monsters will be destroyed, including Prime Material Dragon. There is no way to only let Dark Hole destroy some monsters and then be prevented from destroying others in that way.
Yes it can. It negates the effect of any EFFECT MONSTER that is destroyed by any fiend monsters.
Yes. Not only will Baou negate the Flip Effect of monsters, but it will also negate all out of play effects too. A destroyed Witch of the Black Forest will not trigger her search effect, Helpoemer's discard effect will be inactive, and a Treeborn Frog cannot be special summoned, etc.