Armageddon Knight

Edison Card Text
① When this card is Summoned: You can send 1 DARK monster from your Deck to the GY.
No targeting
No Damage Step effect
Banlist • Unlimited
Interactions
Optional Trigger choice after Summon
Armageddon Knight is Normal Summoned; the turn player may trigger its effect or keep priority.
Player A Normal Summons Armageddon Knight, which has an optional Trigger Effect. Player A can either activate that effect (passing priority to the opponent, who may respond with Torrential Tribute) or choose not to activate it and retain fast and Ignition Effect Priority.
Priority after chain resolution
A chain resolves with Armageddon Knight sending Malicious; priority returns to turn player.
A chain resolves where Armageddon Knight’s effect is the last thing to happen, sending Destiny Hero - Malicious to the GY. No Trigger(-like) effects activate. The turn player retains priority to activate a Spell Speed 2+ effect, but cannot activate Malicious’s Ignition Effect yet. If they pass, the opponent may respond with D.D. Crow.
Rulings
edisonformat.net
● If this card is Summoned as chain link 2 or higher, its effect misses its timing, and can't activate.
You can read more about Timing here:
https://edisonformat.net/rules/compendium/missing-the-timing
edisonformat.com
(1) When this card is Summoned, you can send 1 DARK monster from your Deck to the Graveyard.
The (1) Trigger Effect is optional, it activates & resolves on the field.
This effect activates in the Summon response timing (like "Trap Hole").
While "Macro Cosmos" is active, the DARK monster sent is banished instead.
This is not a cost. The DARK monster is sent to the Graveyard when this effect resolves.
This effect CAN'T activate if this card was Summoned as Chain Link 2+ (by "Call of the Haunted").