* Fiendish Chain works by negating the activation of a monster's effect. It does not negate the effect of a monster being summoned.
* Red-Eyes Darkness Metal Dragon doesn't have an effect that activates. Its effect is passive, meaning it's always active while it's on the field.
Here's how it works:
1. You summon Red-Eyes Darkness Metal Dragon.
2. It has its passive effect that prevents your opponent from activating monster effects.
3. You can't use Fiendish Chain to negate this effect because it's not being activated, it's constantly active.
Possible alternatives:
* Effect Veiler: This card can be used to negate the summoning of Red-Eyes Darkness Metal Dragon, preventing its effect from taking place altogether.
* Solemn Judgment: You can activate Solemn Judgment to negate the summon of Red-Eyes Darkness Metal Dragon and destroy it.
* Other monster effects: There are various other monster effects that can negate or destroy a monster during the summoning phase.
Remember to always check the specific card text to confirm its effects and how they interact with other cards.