Use eBay sold listings, TCGPlayer market prices, and online price guides to see what people actually paid, not just what sellers are asking
I do think that theres a lot of fun to be had with these cards, but the way you get attractions and stickers in Cube is going to either involve going really hard on supporting these themes and having those cards be draftable, or doing a house rule where you provide some to players outside the draft
C Common Champion's Vigilance X TRAP Counter If you control a Level 7 or higher Normal Monster, when a monster(s) would be Summoned OR a Spell/Trap Card is activated: Negate the Summon or activation, and if you do, destroy that card
Its an easy way to fill the bin for cards that care about having a mass of cards in the graveyard, like delve spells or cards with delirium
The Mewtwo pack art may ring a bell, or perhaps the popular shiny Pikachu art
You can choose up to one creature from each player, yourself included, and roll the dice on what pops out