Bug Bite 10
Wilds of Eldraine even features a card with a similar ability - Callous Sell-Sword, which lets a creature deal damage equal to its power to any target in exchange for its sacrifice
Discover Magazine article: The Mathematics of Shuffling: A magician turned mathematician saves the casinos' shirts, which discusses the Diaconis and Holmes work on shuffling machines SIAM News : Within Every Math Problem, For this Mathematician, Lurks a Card-Shuffling Problem contains a detailed discussion of the Diaconis and Holmes results
Oddish's evolutionary line, which includes Gloom, Vileplume, and Bellossom, illustrates the branching evolution mechanics introduced in later generations, allowing players to choose between different evolutionary paths
Each box contains six booster packs, a special rare or mythic rare card, a deck box and spindown die (Editors note: No, you cant use spindowns for D&D even though they have 20 sides)
Considering Lucario's long TCG career and impressive popularity, it's difficult to claim top honors, but this card's gorgeous illustration is deserving of the spot