Combustion

1R
Instant

Combustion cannot be countered by a spell or an ability. Combustion deals 5 damage to target white or blue creature. The damage can't be prevented.

I'm not going to lie, I don't know the red equivalent to deathmark/celestial purge/flashfreeze/the awful green one. It's probably bad, but not enough to try to
make an acceptable equivalent for m10. It kills baneslayer, but so did any 2 common burn spells/plated geopedes. Maybe if all the playable white and blue creatures didn't have protection from red or shroud this could be a playable card. Unfortunately no one plays instant prevention, and no waste counters to protect wall of omens.

Maybe next time they will give red an edict like spell, or stop making a splash-able hoser that shuts down a deck in the first 2 turns.