This card can Special Summon "Dragunity Primus Pilus" without tribute. However, doing so will cause "Primus Pilus" to miss the timing on its effect.
By using this card in a Cyberdark deck, your Cyberdark monsters can be turned into level 4 Tuner monsters, giving you easy access to monsters like "Stardust Dragon" or "Red Dragon Archfiend", which can later be used to create an immensely powerful "Cyberdark Dragon". Even if you don't use them for a Synchro Summon, they will still have 2000 ATK while equipped with this card, making them quite powerful for their level.
Select "Dragunity Militum" for this card's effect so that you can use it to Special Summon this card from the backfield and tune for level 6.