The final Dominus is the red one, a straightforward spellslinger/burn damage booster. The former might be a better option with that activated ability.
2022 Average Peasant Cube
Because I have more decks than fit in a signature
as Long as your deck has lots sources of noncombat damage and wants cards in the graveyard (via flashback, reassembling skeleton effects) this is a must.
W(W/U)U Ephara - Flash & Taxes W(W/U)U || B(B/G)G Meren - Circle of Life B(B/G)G
RGW Marath - Ever shifting Wilds RGW || (U/R)C(W/B) Breya - Artificial Dominion (U/R)C(W/B)
UBR Becket Brass - take what you can, give nothing back UBR