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Once its equipped, it gives the creature +3/+3, vigilance, and then you can tap and sacrifice the creature to add three mana of one color

However, basically, you cannot use it as a partner, and as long as the number of times you have fought and won against Ray while linking the previous game to UMD is a multiple of 15, you can become a partner in Tag Duel by making Ray your partner and then going to the Obelisk Blue Dormitory and watching the event

This comes down to how strong you want the deck to be

Pick whichever matches your collection's vibe

But this would be a good option for acceleration if youre running a deck where you know the curve is too high