I played Generaid Traptrix, I played this deck initially cause I wanted to throw this YTC as to have more time testing "Phantom Fish" so I made a simple to make deck. But life doesn't happen as you expect it to and I truck gold with this deck.
I prepared for this YTC by playing against Grimm, playing against him a lot. This didn't help me learn the meta, it helped me more as to just learn basic Trinity. In this list I played too much s/t hate cause I was not considering sera summoning myrm, I also didn't play set rotation as I believed I had enough copies of generaid stage, I am still thorn if that was the right call
This deck was so suprisingly good that my only loss was in swiss against Dark Magician just because I had no idea how to fight that deck, later I rematched that deck in finals and with the experience from my swiss match won.