In case you want to really lean into the Synchro Summon aspect of the Deck, Shiranui Solitaire is another way of finding your best Tuner, Uni-Zombie
That made Obosh, the Preypiercer a great damage doubler in this deck, and a great way to speed up your opponents loss of life
UR Ultra Rare Blue-Eyes Ultimate Dragon X LIGHT Level 12 [ DragonFusion ] ATK 4500 DEF 3800 "Blue-Eyes White Dragon" + "Blue-Eyes White Dragon" + "Blue-Eyes White Dragon" SE Secret Rare Blue-Eyes Twin Burst Dragon X LIGHT Level 10 [ DragonFusionEffect ] ATK 3000 DEF 2500 "Blue-Eyes White Dragon" + "Blue-Eyes White Dragon" Must be either Fusion Summoned, or Special Summoned by sending the above monsters you control to the GY
We think you can agree that with this and Underground Sea on the list, it must mean the combination of Red, Blue and Black must be the best one in Magic - and that means Nicol Bolas is probably right
The culmination of this approach is consulting EDHREC, but not knowing how best to use it