It's certain some cards will have been overdrafted, and there are always some sleeper hits (Goblin Blast-Runner, lookin' at you)
Generally, these are what the Colors are best at: White : Great at preventing damage and gaining life Blue : Has Creatures and Spells that help with drawing cards from your deck and countering your opponent's Spells Black : Can manipulate the Graveyard by playing Creatures and Spells from it Red : Combat focus and has many options of direct damage with Creatures and Spells Green : Excels at gaining Mana to summon powerful monsters to the field swiftly You can also find inspiration by exploring the different Tribes in Magic
2 Phenax, God Of Deception The Dimir god of Theros, Phenax, God of Deception is a potent commander that excels at milling its controller and their opponents alike
That said, preparing Kirol is a relatively unexciting gravebreak trigger, and the extra mana might be better spent on something elselike playing a card you recurred from the graveyard or casting a spell with flashback to trigger a more impactful synergy
As someone who has come into Magic recently as a writer, a player, and just a fan of the mythos, there is a lot I do not know