Yard Sale or Garage Sale This may be the either the obvious answer or an option you have yet to consider
Any time you have fewer lands than your opponent, if you cast Balance, theyll sacrifice lands equal to the difference
2) I just love the conversational style of the card "retains all its original abilities as well" nowadays the card would be strictly to the point that the only change is that it's now also a creature no need for this bonus information
I didnt find any valuable cards in either of my two MM1 drafts, but I did finish with a Finks, a Witness, an [mtg_card]Electrolyze[/mtg_card], a [mtg_card]Murderous Redcap[/mtg_card], a [mtg_card]Relic of Progenitus[/mtg_card], a [mtg_card]Narcomoeba[/mtg_card], a [mtg_card]Lightning Helix[/mtg_card], and a few other goodies
Mythical Slab is classified as a 2-Diamonds card in the Mythical Island set
Item ID: 318628133