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Basically any and every card that synergizes well with Bolas planeswalker and creature cards are in Grixis colors, so go wild and build an all-out Nicol Bolas deck

Special Summon 1 Level 4 or lower monster from your Deck

For the rest I'd recommend more tutors to find Jeskai Ascendancy like Enlightened Tutor and Idyllic Tutor, some good recursion like Underworld Breach, and better mana-fixing like shocks / ABU / fetches

Its easy to see why, as Commander decks are more or less synonymous with taking a few turns to get going via ramping mana, setting up mana rocks, playing supports cards and so on

Yes, getting a card graded is worth it if your card is rare, valuable, or in excellent condition