Geosurge is still good enough to drop a big finisher (Inferno Titan, Wurmcoil Engine, maybe Balefire Dragon if you want to get cute) on turn 4, but that requires having both the enabler and the big creature in your starting 10 -- and remember that contemporary mono-red doesn't really have filtering or card draw
And the Pikachu which would be 1/3rd decks (~16 or 17) can already be found in one collection (Ignore the top-left one, which is 1st edition
Karumonix, the Rat King, offers a unique approach to poison-based Commander decks with a Rat theme
A good sideboard should always have a plan for the graveyard
Pod has many uses in this deck, helping me grab token creators like MycolothMycoloth and Avenger of ZendikarAvenger of Zendikar, additional sacrifice outlets like Sadistic HypnotistSadistic Hypnotist, and cards that give my giant army a way to push damage through like Pathbreaker IbexPathbreaker Ibex