Where to buy: Yahoo Auctions Japan and Mercari Japan (via proxy services like Buyee or Zenmarket) for the deepest domestic market
At the very high end, there's the recently sold CGC 10 Alpha Black Lotus, which set the record for being the most expensive Magic card every sold
For this reason, its a pretty useful card to have in duels, if you have five ink to play it, of course
While increases in mana cost are associated with worse win rates for common and uncommon cards, for rare and mythic rare cards, a mana cost one higher increases the expected win rate when seen by 0.65% and 0.55%, respectively, with an approximate error of \(\pm\) 0.3%.
Dark Depths combos use the graveyard well, as do ones leveraging Fastbond (in the few formats it's legal in)