on right click holding a feather:
    name of held item contains "§aDoubleJump"
    push player upwards at speed 2
    execute console command "execute %player% ~ ~ ~ /particle lava ~ ~ ~ 0.1 0 0.1 0.2 20"
    execute console command "execute %player% ~ ~ ~ /particle flame ~ ~ ~ 0.1 0 0.1 0.1 20"
    execute console command "execute %player% ~ ~ ~ /playsound minecraft:block.lava.extinguish master @a ~ ~ ~"