Among the hardest to find of these are the multiple "Eeveelutions", and one such difficult card to find (of the psychic type, Espeon) sold in 2021 for an impressive $22,100
While it has a high enough mana cost for players to build up place creatures before it is cast, it is still very dangerous, and, being a black demon creature type, it can be brought out with cards like Shadowborn Apostle or Demonic Tutor
One can assume, given the game's free-to-play game trappings (mimicking some of the a la carte payment practices of a game like Marvel Rivals ) that these trades will not come free, likely requiring some level of currency for trade to take place
Optional I've experimented with all kinds of cloths to clean cards
I just have to dodge a Siege-Gang Commander
Gives you access to counterspells, big creatures, and damaging spells and hes a 1/1 wait