Aang's got a lot to learn before he's ready to save anyone, so start at the beginning and journey with the Gaang to master the elements and save the world
Callaphe doesnt face that sort of divine oceanic enmity, which seems to free her up for more adventures and more trickery
Ingot Chewer and Mulldrifter can be cast cheaper when evoked, and then instead of paying the full whack, you can just make Offspring to keep one and get an extra EtB for value
Its definitely a hard task, but it can be plenty rewarding
Mardu At the beginning of your end step, if a creature died under your control this turn, each opponent sacrifices a creature of their choice
I hope you have a spectacular prerelease and pull a lot of good galaxy foil cards, but above all else, have fun