It won't be named "your choice of A, E, I, O, or U." The token doesn't have any abilities and doesn't usually do much except give you a vowel to work with when spelling words
For example: Normal- and Fighting-types cannot touch Ghost-types Ghost-types cannot touch Normal-types Poison-types cannot touch Steel-types Ground-types cannot touch Flying-types (unless a move is used to knock it out of the air) Electric-types cannot touch Ground-types Psychic-types cannot touch Dark-types Dragon-types cannot touch Fairy-types
Shade the Obscure Level 4 DARK Fairy Pendulum Effect Monster ATK/ 1000 DEF/ 1000 Pend
Cards in Sharpie Cube end up looking like NSA documents, only instead of damning surveillance records they're giving a Colossal Dreadmaw the Storm keyword by blacking out the rest of its flavor text
The notion of "the best" is subjective, depending heavily on your criteria: raw power, format dominance, historical legacy, or even sheer financial value