what is a pokemon promo card Pokémon TCG Pocket Series - All Cards in Each Volume! Dumb question but what are

They assign meaning and value to various game actions

Once you stockpile 10 and make it to your next upkeep, you win the game outright

With an Elvish Warmaster or two hanging around, you can get to the point where it doesnt even cost any mana and gets the full fourteen +1/+1 counters

While the slot saw a 25% bump in value compared to Iconic Masters (which had a reasonable amount of uncommon value itself) in absolute terms, this 25% increase only amounts to a $5 jump in box value, from around $15 to just under $20 of uncommon value per box

DUSKMOURN COMMANDER: ARTIFACTS & LANDS Who put Toy Story in my Duskmourn

Most players shouldnt have an issue with you shortcutting like this, and it can save you a lot of time, and importantly, money