Theyre all great cards, but "Skill Drain" is both the best and most easily abused among them
This Supporter can quickly turn a bricked situation into a favorable one, and as mentioned, it often works as a Professors Research on steroids when the opponent has a large hand
Urabrask the Hidden The Phyrexian praetors can always turn the tide of a game by giving huge advantages to you
My favorite, Im with you r2d2, is base, but seriously jungle, fossil, gym sets
The new theory presented by @pokemonrevolution suggests sheets are stacked on top of each other before the 1st edition stamp ink was dry, causing both the imprints at the back of the cards, as well as the Grey stamps
Then your landfall here will toss a +1/+1 counter on a dork you control, ideally Obuun to pump your Elemental making