Instead, realize that SUM-LOT is a format that severely limited how powerful decks could be on the first turn since they no longer had access to Max Elixir for a near-guaranteed Knock Out on any Active Pokmon on turn 1
For regular upgrades I highly recommend: Vito, Thorn of the Dusk Rose, Mondrak, Glory Dominus, Anointed Procession, Parallel Lives, Eerie Ultimatum, and you can also run the Cat Oven combo with Cauldron Familiar + Witch's Oven + Clock of Omens, and there's the Ballista Combo Heliod, Sun-Crowned + Walking Ballista, and finally the Exquisite Blood Combo since the deck already runs the other piece Sanguine Bond One Down, Three to Go
Kaldheim seems packed with them after all, and the more compelling legendary creatures there are in Standard, the more appealing Kolvori becomes to build around
Duelist Kingdom and Battle City