Sacred Noble Knight of King Artorigus

The monster effect "①: When this card is Xyz Summoned: You can target up to 3 'Noble Arms' Equip Spell Cards in your Graveyard; equip those targets to this card" is a Trigger Effect. (It can be activated during the Damage Step. It targets 1 to 3 "Noble Arms" Equip Spell Cards in your Graveyard. You cannot target 2 or more cards with the same name.)

The monster effect "Once per turn: You can detach 1 Xyz Material from this card, then target 1 other monster on the field; destroy it." is an Ignition Effect. (This effect targets. Also, detaching 1 Xyz Material from this card is a cost to activate the effect.)

The monster effect "③: If this card is sent from the field to the GY: You can target 1 Level 4 or higher 'Noble Knight' monster in your GY; Special Summon it" is a Trigger Effect. (This effect targets. It can also be activated during the Damage Step.)

You cannot target a "Sacred Noble Knight of King Artorigus" that had its Synchro Summon negated and was sent to the GY to be Special Summoned.