Caius the Shadow Monarch

Edison Card Text
① If this card is Tribute Summoned: Target 1 card on the field; Banish that target, and if you do, your opponent takes 1000 damage if it was a DARK monster.
Targets
Note: the first part of the effect
No Damage Step effect
Banlist • Unlimited
Interactions
If I tribute summon Caius by tributing Sangan, which effect triggers first?
Sangan is tributed to Summon Caius.
Both effects are mandatory, but Sangan's trigger happened first (sent to the GY as Tribute), so it is Chain Link 1. Caius's effect is Chain Link 2 because it triggers after the Summon is successful.
If I tribute summon Caius by tributing my opponent's Sangan, which effect triggers first?
View 1 moreOpponent's Sangan is tributed to Summon Caius.
Both effects are mandatory, but Sangan's trigger happened first (sent to the GY as Tribute), so it is Chain Link 1. Caius's effect is Chain Link 2 because it triggers after the Summon is successful.
It doesn't matter that it's opponent's Sangan because early trigger overrides turn-player (more in SEGOC)
Rulings
edisonformat.net
● If your opponent has no cards on the field after taking 1000 damage from this effect, they can activate the effect of "Gorz the Emissary of Darkness".
● No damage is inflicted if the banished monster was a Token, Trap Monster, or was not originally DARK.
edisonformat.com
(1) When this card is Tribute Summoned, remove from play 1 card on the field. If it was a DARK Monster Card, inflict 1000 damage to your opponent.
The (1) mandatory Trigger Effect activates when Caius is successfully Tribute Summoned.
If the target is a DARK Monster Card when banished, inflict 1000 Points of damage.
Your opponent CAN use "Gorz, the Emissary of Darkness's" effect in response to the Effect Damage which was inflicted AFTER their only card (a DARK monster) was banished.
DO NOT inflict damage if the monster is not DARK when banished by this effect.
Examples include Token Monsters, Trap Monster, Monsters who are only DARK while face-up on the field (ex: "Light and Darkness Dragon").
DO NOT inflict damage if the DARK Monster is banished by a Condition instead.
Examples include "Battle Fader", and "Plaguespreader Zombie".
DO inflict damage when a DARK Monster equipped to "Relinquished" is removed from play.
The target must remain on the field in order to be removed from play by this effect.
You CAN Tribute Summon Caius while "Imperial iron Wall" is active.
This effect STILL activates while "Imperial Iron Wall" is active (starting a chain). A target it declared, but no cards can be removed from play while "Imperial Iron Wall's" effect applies.
"
Monarch
's" Trigger Effects are Spell Speed 1 and activate at the time they are successfully Tribute Summoned. If the opponent wants to activate a card like "
Bottomless Trap Hole
", it will be placed onto the chain after the "
Monarch
's" effect. But "
Monarchs
" don't need to remain on the field to resolve their effects, so destroying them with "
Bottomless Trap Hole
" will not negate their effect.