Pros: Best return per card for anything worth $1+ Fast listing process (no photos needed) Cards sell passively once listed Direct fulfillment option removes shipping hassle Cons: Only makes sense for cards worth $1+ Requires sorting time $0.30 per-transaction fee hurts on cheap cards Not suitable for true common/uncommon bulk Best for: The "middle tier" of bulk cards worth $1-$10 that are too valuable for a bulk buyer but not worth the effort of an eBay listing
Many notoriously expensive MTG cards have experienced this, from Tarmogoyf to the ten shocklands, but their prices usually go down with reprints
If you need a copy you can snag the Ixhel, Scion of Atraxa lead Corrupting Influence precon, although outside of Phyresis Outbreak itself there isn't much value in the deck with the next most expensive cards being Karn's Bastion and Glistening Sphere at around $4
Most modern booster boxes are easy to find, but many have already accumulated value since they went out of print, so it can be difficult to make money quickly on them
When it comes to battling Darkrai, you can choose to use Pokmon which are lower than Level 50, but can use moves which Darkrai is weak against
On your own end, Energy acceleration and DCE makes being able to have 3-4 energy on Mewtwo EX fairly common, giving you 60-80 damage to start with before you begin to add the extra damage your opponent will give you