My Despia Bystial Branded deck - the flex/side spots in the main are the 3x Kashtira Fenrir, 3x Forbidden Droplet, and 3x Infinite Impermanence.
The idea is that these 9 cards are hopefully generic 'good' cards, which can play well enough going 1st or 2nd into Ishizu Tear, Floo, and Rogue decks.
Sideboard is 3x Dimension Shifter and 3x Dimensional Fissure for Ishizu Tear, subbing out 3x Fenrir, 1x Mercourier, 1x Branded in Red, and maybe 1x Albion? Thinking that these 6 'Dimension' cards pair well w/ our Bystial handtraps, and that Branded in Red is hard to play against the Ishizu Tear GY shufflers (and is a nonbo w/ our shifter/fissure), Mercourier runs into the same problem (must be sent to the GY to activate), and that Albion is an Upstart Goblin that depends on the GY being available, so it is turned off by shifter/fissure.
Against Floo, I'm thinking of subbing in the Zombie World, Necroworld Banshee, and Feather Duster. We would sub out 2x Druiswurm and 1x Saronir. These Bystials should be harder to get value on due to Floo not being Light/Dark, and Zombie World should lock them out, while Feather Duster is just generically good.
The remaining cards - 3x Evenly Matched and 3x Cosmic Cyclone, should be generically good going second or into decks that depend on spells/traps.