No clue where to go with my first SOI sealed pool

I'm on RB, splashing white for declaration of stone and unmaking. You have the call/skeleton combo, plus removal in black, and red has a good curve and quality creatures.

I would have a RW aggro deck as your "base" deck but I think you can sleeve up a UW flyers deck as well against ground-based GW or GR. BR seems strong as well but you're maybe thin a playable or two.

RB splash White is another option, but I'm unsure how good it could be. I'd be concerned it's too slow to get under decks and it doesn't have enough big stuff going on to go long against some of the delirium/clues decks. I think this is why I would stick to two colors and RW is the most aggressive for you to have the chance of going under opposing decks.

Focus your deck on what you are trying to achieve and build everything around that plan.

Red looks like your best color, and you have some really good creatures in white. Black looks pretty solid too.

I would probably make a white/red aggressive-leaning deck and a white-black midrange. Necropod and reaper alongside your nice unconditional removal should make for a strong end-game.

This is another pool where my match approach would probably be scare them with my aggressive deck then consider switching decks (to WB) during boarding.

Last thought: don't undervalue magmatic chasm in sealed; it's a nice finisher for an aggressive deck. Though you do have flameblade, reaper and burn from within, so maybe you don't need it. You could board it in if you see very few flyers.