Cards that let you play a spell when you discard, like Loxodon Smiter, were designed as an answer to discard effects like Liliana of the Veil
When it swings, each other opponent gets attacked by a copy of that dork, which is pretty good
Rampant Growth | Illustration by Steven Belledin Ramp gives you more mana than you'd normally have at any given point in the game , considering that you can make only one land drop each turn
This is useful in just about any red deck, but it does do more for red decks with plenty of treasure token generation in them
Still, its a safe bet to start out with any artifact which lets Trazyn untap itself for three mana or less: Retrofitter Foundry, Basalt Monolith, Pili-Pala, Staff of Domination any and all of which should make Trazyn lethal once you get Gilded Lotus or Sceptre of Eternal Glory into the bin with them