Can be used on tum 2 and onward. Select up to 2 "The Phantom Knights" monsters on your field that have a Level. When Xyz Summoning a monster using these "The Phantom Knights" monsters as Xyz Materials during this turn, you can use them as Level 2-4 monsters.
This Skll can only be used once per turn and twice per Duel.
This is less fix your hand and more fix your field.
Like, if you're forced into a situation where you can have only 1 level 3 and 1 level 4 on your field. With this skill you can Xyz with them, since you can make both have the same level.
It's for the same reason "Territory of the Shark" is a skill used by many back then, when Water Xyz deck is still meta.
Freakin' finally, a way to actually summon the Rank 2 PK Xyz.
(also allow summoning Dark Rebellion more easily, but honestly the more important part is that the Rank 2 PK is finally summonable, who the hell is the idiot at Konami who decided a Rank 2 PK as level up reward with no access to any Level 2 PK is a good idea?)