Insight Engine and Uthros Research Craft provide long-term card advantage to take advantage of grindy Commander games
To top things off it lets you cast a 5-drop from your hand without paying its cost, effectively making it a 1-mana draw spell with an upside
4 //// Marchesa, Resolute Monarch Legendary Creature Human Noble 3/6 Menace, deathtouch Whenever Marchesa, Resolute Monarch attacks, remove all counters from up to one target permanent
That said, card grading requires a small to moderate learning curve, and it may be wise to consult an experienced submitter, check out a YouTube tutorial, or even ask questions in a Pokemon Facebook group before submitting a card(s) to a service
Seriously, not even a board-wide exile can punch through it