Lorwyn introduced the first five planeswalkers, then the next three sets ( Morningtide , Shadowmoor , and Eventide ) had zero planeswalkers in them
Although Graha Tia, Scion Reborn is its other possible commander card, its best to use Yshtola, Nights Blessed
Six mana cards are generally not utility or answer cards which are the most useful to be able to tutor for, Treasure Mage will mostly go and find a win condition, which then begs the question as to why you are not just playing more win conditions or more effective draw spells
What to Change Out: 1 Rise of the Dark Realms M 2 Bake into a Pie C 2 Stab C 2 Crow of Dark Tidings C 2 Gleaming Barrier C 3 Zombify U In: 2 Kiora, the Rising Tide R 4 Cruel Somnophage R 2 Shoot the Sheriff U 2 Huskburster Swarm U 2 Overlord of the Balemurk M Total wildcards needed : 2 Mythic rare, 6 Rares, 4 Uncommons, 0 Commons #9
Several months prior, I had alerted the team to the issue with multiple copies, and tried to lead them in the direction of the wording it ended up taking, only to be pleasantly surprised when they actually followed through on that request