You could probably add a solid $5 to each of these numbers to account for the unknown cards, and even more if anything ends up taking off, or if there are any particularly generous bonus card reprints
Weve offered some more free-to-play friendly alternative cards to help you in the meantime though

Yenoh on [EDH] Varina or: How I learned to love discard 7 years ago RobsJourney Crucible of Worlds is really strong with the addition of cycling lands and its very nice being able to discard lands you draw instead of gas, Planar Birth is also really strong for this At the moment the deck is less focused as I want it to be casual but I could see it being made into either token swarm, draw/mill matters or lifegain so if you wanted to focus the deck around cards like Psychic Corrosion you just need to cut cards from other themes, if you do that I think focusing on tokens with the addition of cards like Bident of Thassa, Kindred Discovery , Coastal Piracy, Psychosis Crawler, Patient Rebuilding, Mindcrank, Altar of Dementia, Altar of the Brood, Undead Alchemist would be good I am currently focusing on making the deck more self discard focused because its fun as hell and when else would you use Dark Withering, Cunning Survivor or Spirit Cairnbut the lifegain element has actually been incredibly strong so I am looking at making a lifegain shell with cards like Rhox Faithmender,Sanguine Bond, Necromancer's Covenant, Whip of Erebos fergus23 on Ressurection Chromium 8 years ago Ojutai, Soul of Winter Scalelord Reckoner Silumgar, the Drifting Death Scourge of Nel Toth Retrace cards

So, to that end, we'll be using Tifa to swing in for damage multiple times
The staining might affect only a small part of the card, but it is enough to receive this qualifier
Lets go over our picks, plus some reasoning for each