This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:● You can Tribute this card to Special Summon 1 Gemini monster from your Graveyard, except "Blazewing Butterfly". A Gemini monster Special Summoned by this effect is treated as an Effect Monster, and gains its effect.
You need to farm lv30-40 legendary duelists for them. Lv40 is better for farming SR/UR jewels, because they have a greater chance of dropping rare cards that can be exchanged for them. Gate events, like the current Paradox Brothers, are great for farming them, because it's easy to accumulate lots of keys quickly. If you save up duel orbs, you can farm Standard Duelists for even more keys.