@pokemonrevolution recently presented a new and likely theory for these Grey Thick stamps, which I will quote here: Grey Stamp Theory Grey stamped 1st Edition Base set cards for the most part have commonly been considered to exist because of either A) The ink was low when they were stamped B) The stamp was not pressed down with enough force to create a nice dark color
A great example of how broken it can be is to look back at the one time it was included in the MTGO Vintage Cube for a time and was quickly removed due to its dominance
For the older decks, we know how they play, but we're also factoring in their total value in 2026 alongside mechanics, upgradability, and again, most importantly, whether they are fun to play
Pyromancer allows us to generate incremental pressure while we cast spells we want to be casting anyway
the old cards arent even legal in the modern game
Funnily enough, this also picks up -1/-1 counters, finality counters, stun counters, or any other detrimental counters that end up on your creatures