Wan Shi Tong

I alluded to that earlier from Edge of Eternities, the seven-man artifact that rewards you for just playing the game of Magic the Gathering.

Then, Wan Shi Tong Librarian, the Fairy Mastermind variant that rewards you with some card draw at flash speed.

That had 112 deck appearances.

Printed in November, that's a pretty big increase in terms of popularity.