Wow this has gone unused.
Thinking I'll be commiting to building my first Pioneer deck this summer so I'm posting for a little advice on deck suggestions.
Collection: My collection of cards consists mostly of cards I built into causal jank from the timeframe of Dominaria to Throne of Eldrane. The most powerful cards I remember were 3 Gideon Blackblade, 2 Circle of Loyalty, and a playset of Unbreakable Formation. Other cards I owned included some light planeswalker support from War of the Spark and some Aura/Equipment stuff in Dominaria/M19. I'm not requesting that any one of these be the basis of a new deck in particular, but if it inspires a suggestion I hope it helps. (Though getting to use Gideon Blackblade again would be pretty swell)
Colors: Playing white is basically non-negotiable for me since I have so many plains lying around, and its my favorite anyways. Mono-white is certainly fun, and I can enjoy playing any of the two color pairings with white too. Playing with the enemy color pairs in particular gives me a fun sense of dynamic in the deckbuild, but ally pairs are cool too.
Budget: I tend to play on the lowest budget possible, so I'll probably find ways to cut down price with whatever you recommend. Most of the money comes from lands anyways and I embrace the tapped-lands with open arms.
Style: Based on my experience play other card games in the interim, on a scale from aggro to control I typically play midrange with aggro elements, though I like to think I'm flexible. Tribal decks are a favorite of mine, since they tend to be positively gushing flavor.
Level: I hope by now its clear I'm just here to play casual and have a good time! Suggestions that lead into higher levels of play are perfectly fine in case we wanna future proof a little.
TL;DR
Likes: White, Enemy color pairs, Midrange with some aggro, Tribal decks, Gideon, Flavor.
Only hard request is that the deck has plains in it, otherwise open to all kinds of suggestions.