[CONT](Front Row RC):All of your rear-guards with different card names as this unit cannot be chosen by your opponent’s card effects.
[AUTO](RC):When this unit attacks, if you persona rode this turn, this unit gets [Power]+5000 until end of turn.
Knight of Guard Spear, Arsen is a knight from the Keter Sanctuary. He is a grade 2 unit with 10,000 power and two abilities. His name properly represents one of his abilities because he protects your rear-guards. You may play this unit in the D-Standard and Premium formats.
Knight of Guard Spear, Arsen provides protection for your rear-guards. Knight of Guard Spear, Arsen prevents your opponent from targeting your rear-guards with different names from this card with effects. The opponent cannot easily remove your units from the field.
Furthermore, Knight of Guard Spear, Arsen is a good card against Dragon Empire. This ability stops part of Dragon Empire’s strategy to retire a player’s rear-guards. You will maintain your army of rear-guards.
Knight of Guard Spear, Arsen has an impressive offense. Knight of Guard Spear, Arsen gains 5,000 power when you persona ride your vanguard. This increase in power in combination with the persona ride adds 15,000 power. Knight of Guard Spear, Arsen with a total of 25,000 power can hit any opposing vanguard.
Furthermore, this ability has offensive synergy with Apex Ruler, Bastion. Apex Ruler, Bastion may stand Knight of Guard Spear, Arsen for an additional attack and adds 10,000 power to Knight of Guard Spear, Arsen. This duo puts pressure on the opponent with a beautiful display of offense.
Play these cards with Knight of Guard Spear, Arsen in the D-standard format!
King of Guard Spear, Arsen is a decent card in the premium format. His first ability is the only reason to play him. His second ability for persona ride is not an ideal fit for the premium format. Gold Paladin, Royal Paladin, and Shadow Paladin can use King of Guard Spear, Arsen. The protection from his first ability is a nice advantage against certain clans.
King of Guard Spear, Arsen is an effective rear-guard with Altmile and Alfred. His first ability protects the rear-guards from both of these archetypes. Altmile and Alfred depend on their rear-guards for support. You want their best units like Blaster Blade on the field.
However, some cards can bypass Knight of Guard Spear, Arsen. For example, Exculpate the Blaster from Royal Paladin attacks all of your units. His ability does not retire them with an effect. Exculpate the Blaster retires the rear-guards by battle, and that is not an effect.
Play these cards with Knight of Guard Spear, Arsen!
Overall, Knight of Guard Spear, Arsen is a decent card for the D-Standard Format. I would recommend Knight of Guard Spear, Arsen in a budget deck. He has synergy with Apex Ruler, Bastion. You can create strong combs with this duo from the Keter Sanctuary.
D-Standard Format: 
Premium Format: (3 / 5)