[C][C][C] Cruel Arrow: This attack does 100 damage to 1 of your opponent's Pokemon
Choosing the the most important or impactful creature on the board and then the biggest creatures from your other opponents will is going to net you a pretty impressive body on top of the 7/8 youre already getting, with the benefit of what enters-the-battlefield or static affect the actually copied creature gives
Other rarity bumpers include the exclusive National Championships and Staff marking that can be found within the box
If you want the official boundaries in one place, PrintMTGs proxy policy is very explicit: casual play and playtesting yes, sanctioned tournaments and resale as real cards no
Normally you had a dork that could fetch either an artifact or an enchantment, such as Sanctum Gargoyle
Giving all of your creatures, including tokens, the myriad ability is very powerful