Vintage Cube is more or less the fast mana format, and its easy to understand how one player having access to six mana to the other players four can lead to all kinds of snowballing advantages
Creatures with persist will be around longerin fact, with a zero-mana sacrifice outlet and a persist creature, you can go effectively infinite
Some companies allow you to make an appointment to drop off cards for in-person grading
Trample, lifelink, +1/+1, and a way to threaten the permanents your opponent thought were safe, all on a 1-mana artifact
With the number of artifacts, enchantments and planeswalkers decks play varying wildly you cannot really abuse an ability to remove them in green as you cannot play more than a couple of such effects in a main deck
Aside from the booster box effect, Japanese cards are often easier to grade