Notes & Combos
Utopia deck used for the Light/Earth part of Duel Triangle
Going first you set up a board that should end up on at the very least Dragonar with a Ultimate Leo equipped with a Twin Pegasus Saber and 2 materials to summon Hope Harbinger during the opponent's draw/standby phase (to avoid Tactics) with an extra Utopic Draco Future or a Numbers Protection in the right opening hands (or some luck with Xyz Change Tactics).
When going second and should the opponent have a simplified board state, the math says 2 level 4s is lethal against a monster with 2k or less attack that is in attack position.
The lack of the Armored Xyz package (since the 2 Xyzs had to be Water) meant the 2 ED slots had to be replaced with an extra target for Seventh Tachyon (I chose Giant Hand for the Earth attribute besides Masquerade for Light) and Numeron Dragon (for very niche situations it never came up yet), while Gagagaga Magician (he's Dark) got replaced with Alembertian (Earth) in order to meet the requirements for UDF.