Multi-headed Cow
Arcane
Been playing mono red for the pauper event myself. Gives you some good flexibility with interaction with your opponent (Which you want since a lot of people are playing proliferate stuff which can go bonkers if you can't interact it into a trash can) and some extra reach for smacking face for closing out. Spellgorger weird can be a win condition in itself since if left unmolested it'll grow hilariously big and then you just wait to draw a trample cantrip and win. Burning prophet helps improve consistency with her scrying and has a nice fat ass for blocking, and everything else is pretty self explanatory. The first strike cantrip isn't as important but still works great with weird and prophet (Especially prophet since her scry triggers first, THEN the draw) but the trample one as mentioned is fairly important. I waffled back and forth on Heartfire or Sarkhan's Catharsis. Catharsis gives you more face burn, but Heartfire's more versatile and you usually have weenies to burn up with Goblin Gathering anyway. 22 land also might be too much for the deck because I swear to fucking god I always end up massively land flooded compared to my opponents even with scrying to try to smooth over some. Pretty fun for a pauper deck though, gives you trickery and a lot of digging around in your deck.
4 Spellgorger Weird (WAR) 145
22 Mountain (RIX) 195
4 Crash Through (M19) 133
4 Shock (M19) 156
4 Burning Prophet (WAR) 117
4 Warlord's Fury (DAR) 151
4 Jaya's Greeting (WAR) 136
4 Chandra's Pyrohelix (WAR) 120
4 Goblin Gathering (RNA) 104
4 Heartfire (WAR) 131
2 Shivan Fire (DAR) 142