(thats me, by the way) Planar Cleansing them, make them cry in the corner
This alone is handy in combat, turning even modest midrange creatures into large and dangerous Tramplers to deal with as Green is every so good at doing
Or let an opponent commit something like Craterhoof Behemoth to the board, then blow them out
The other key pieces of the puzzle are spells that add mana, like Pyretic Ritual and Manamorphose, since they tick up your storm count higher and higher while not tying up your mana for the turn
District Mascot The play pattern with District Mascot will often be to cast this turn 1, then saddle it on turn 2 with something and attack with a 2/2, which is a very solid aggro start
My first option is Freelance deck building