Since Loot wants to offer a ton of impulse-drawn cards from exile, its best to arm your Loot deck with ways to abuse casting spells from outside your hand
This card featuring Mimikyu is a Cosmos Holo and comes from the Paldean Fates set, though the same card has been reprinted many times for a variety of sets over the years
Notably, because Boros Charm wasnt printed in the main MTG Foundations set, its recent reprinting didnt help supply much
As a superfriends lover, This card is a wonderful Superfriends commander that can give us a decent amount of mana or help us cheat in all of our planeswalkers
That aside, there's an extra point in the rules that states sponsors have the right to disqualify entries "not consistent with the spirit or theme of the Contest." Regardless, it's not been officially confirmed that this is the case or if it's the reason certain entrants have been removed from the Contest, so it might be a different issue entirely