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
Dont look at it
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
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
Connive looks ready to slot right into that same category, so dont be surprised to see some cards with it making an impact
Invasion of Ikoria / Zilortha, Apex of Ikoria Although Invasion of Ikoria is a battle rather than a dinosaur, it can be a good way for you to get one from your deck or reanimate one from your graveyard