Each single expend ability can only trigger once per turn
Caesar, Legion's Emperor My favorite color combo for multiplayer is Mardu (you can answer any permanent, discard, and burn things, but no one gets annoyed at you countering their stuff or tempo stuff like Stasis or Rhystic Study), that's why my first Commander deck was a control deck built around Oros, the Avenger
Consider your partner's colors and how nice it is to have card draw payoffs like Diviner's Wand, Horizon Chimera, and Dream Trawler
Tamatoa, Happy as a Clam is also just a strong card in general for allowing you to get items directly from your discard back into your hand and play them for free when he quests
If you like weird synergy-based tempo decks or are just looking for something very different to play as we wait for Innistrad: Midnight Hunt to be released, Simic Kicker seems like a solid budget option for the Standard 2022 format