But, that being said, one did recently sell for around $30K on eBay
Given how often that'll happen in multiplayer, that's a big commonly done trigger
You may cast a creature, instant, sorcery, or planeswalker spell from your graveyard with mana value less than or equal to that spell's mana value without paying its mana cost
You have control over the probabilities, and your assessment of the board can allow you to manipulate how much you get out of the trigger
2) Wild Mongrel This guy was the one that I thought would surely take the top spot as the best budget card ever printed
Alongside any free sacrifice outlet like Ashnod's Altar or Krark-Clan Ironworks, these two can loop each other (or another artifact) into and out of the battlefield infinitely