Not only is Dumbo Evasive, but his ability to give other Evasive characters the same opportunity he has makes him so dangerous against your opponents
Simic has many incredibly powerful commanders like Koma, Cosmos Serpent and Aesi, Tyrant of Gyre Strait that draw the tables aggression early to shut them down

Heres my shortlist of noteworthy upgrade options, divided by price point rather than card function: $1 OR LESS OPTIONS Marionette Master, Armix, Filigree Thrasher, Gravebreaker Lamia, Disciple of the Vault, Voltaic Construct, Ill-Gotten Gains, Stinkweed Imp, Orbs of Warding, Silent Gravestone, Scourge of Nel Toth, Mimic Vat $10 OR LESS OPTIONS Priest of Yawgmoth, Staff of Domination, Crypt of Agadeem, Pili-Pala, Basalt Monolith, Bolass Citadel, Metalwork Colossus, Nettlecyst, Currency Converter, Grim Hireling, Ruthless Technomancer MORE THAN $10 OPTIONS Entomb, Reanimate, Altar of the Brood, Retrofitter Foundry, Cabal Coffers, Defense Grid, Blightsteel Colossus, Darksteel Forge, Revel in Riches, Pitiless Plunderer THEY PUT THE NASTY IN DYNASTY This precon has been one of the hardest to make upgrade recommendations for not because theres any shortage of good options, but because theres just too many equally strong directions to take the deck

Along the way, I will highlight potential Duskmourn: House of Horror additions that stood out to me, as that set will be legal in all of the upcoming Regional Championships
Multicolored is the official rules term for any card that has two or more colors