There are so many possibilities in the deck. Very much searches, and an interesting draw power. The standard starting field i use is Lancer Dragon and Persona on field with at least Arc in scale ( Pendulum Dragon popped at he end, and summoned Lancer through that). Most of the metas use extras to combo and swarm so one good negate from persona can be enough to stop it a bit and Lancer is there to def Persona, and if Persona is defended with anouther Odd-eyes, probably another spec with Arc ( probably another Persona to negate) could happen. Btw, the extra deck is like a toolbox(like the entire deck) with powerful, monsters, and with so more other combos. Here some example: Stardust can come out relatively easy, even with nobledragon spec on a lvl 8, or Synchron in scale with two monster( one atleast lvl7) and after defending from destroy, it coming back to main monster zone so extra is freed, Soul pendulum+Smile sorcerer with other monsters on the field can give a lot of draws, after soul pendu can raise your scale to 9, can pendu summon out sorcerer with others and after soul pendulum got a counter boosting probably your entire field and sorcerer give card about how many monsters including him. I've got 8 card drawed with him in one turn(with soul pendulum, extra pendulum summon). I could write some page with possible combos, but if you're interested you can try it out. Have fun!
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