During your Main Phase: You can Fusion Summon 1 Fusion Monster from your Extra Deck, using this card you control and other monsters from your hand or field as material
Yusei thanks Crow and leaves
The catch is that one-touches come in a wide range of thicknesses 35pt, 55pt, 75pt, 100pt, 130pt, 180pt, 260pt, and 360pt and a generic "one-size" sleeve ends up too loose on the thinner holders and too tight on the thicker ones
To properly run this Deck, every single Effect Monster for this Deck has to synergize
Master Duel gives you a generous number of gems just for completing the tutorial and logging in the first time, enough to purchase all three Special Bundles from the last tab of the in-game shop and you should purchase at least one of them