In the Japanese, Korean, and traditional Chinese subsets, each booster pack contains seven cards with two guaranteed Holofoil cards, and the common, uncommon, and rare cards have Mirror Holofoil variants with a Pok Ball pattern
You'll be doing a bit of math, but that's the fun part
A classic card like Show and Tell says that each player may put an artifact, creature, enchantment, or land card from their hand onto the battlefield. In this case, after Show and Tell resolves, the cards just enter the battlefield naturally, so they dont use the stack and there cant be any response like a counterspell
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The Rare card can upgrade to a Mythic with an indicative rate of 1:8