As for the cost, he can be excluded from GY, so it doesn't hurt

These are some of the best ones I could find: Sin Prodder, Twilight Prophet, Combustible Gearhulk, Sorin, Grim Nemesis, Reviving Vapors, Rush of Knowledge, Ugin's Insight, Interpret the Signs, Nissa's Revelation, Greater Good, Demonlord Belzenlok, Emrakul's Influence Card Draw: Yidris, Maelstrom Wilder, Maelstrom Nexus, Sunbird's Invocation Cascades: Scattering Stroke, Psychic Battle Denial: Timesifter Extra Turns: Favor of the Mighty Protection: Recross the Paths, Selvala, Heart of the Wilds Ramp: Mercurial Chemister, Wolf of Devil's Breach, Riddle of Lightning, Blast of Genius, Disaster Radius, Heretic's Punishment, Kozilek's Return, Nahiri's Wrath, Displacement Wave, Gaze of Granite, Pernicious Deed Removal: Vengeful Rebirth Recursion: Fierce Empath, Treasure Mage, Conduit of Ruin, Grozoth, Sanctum of Ugin Tutors: Spellbound Dragon, Metallurgic Summonings, Kalemne, Disciple of Iroas, Vial Smasher the Fierce, Baneful Omen, Infernal Genesis Beatdown: I'm happy to see that Red is bringing the most value in terms of high cmc support cards

Interestingly, it seems we have one of Jaces relatives named Gav (brother
These subgrades are printed on the label (if you opt for subgrades service) and the overall grade is generally the average, with some rules (e.g., a card wont get a 10 overall unless all subgrades are very high)
Both two-cost cards satisfy Moana, Self-Taught Sailor requirement, allowing you to control the board early if necessary and set up for big lore-gaining turns soon after