In fact, we only get two new cards in the non-budget build of Bounce'n'Mill
I would even consider swapping two more lands for more card draw spells, as the additional card draw should help draw you into more lands
This type of deck loves a little self-mill to get it going, while also having plenty of ramp to be able to recast those cards
As an added bonus, this effect lasts for every vote spell that turn , so casting any other cards that require votes, like Councils Judgment or Magister of Worth, while you have the chance is recommended
Red offers multiple creatures (Guttersnipe, Thermo-Alchemist, Firebrand Archer, Kessig Flamebreather, Electrostatic Field, etc.) and enchantments (Descent into Avernus, Oath of Chandra Valakut Exploration, Dragon Tempest, Impact Tremors, etc.) that dish out repeated damage with a bit of extra work