mtg unfinity card price list is strange. Are any cards in the set legal in tourney play? I know this isn't (below) : r/mtg Top Ten Cards from Unfinity

Heres the other interesting part, the symbol in the middle is the same symbol on the lower right side of the card )marked Resource Generation)

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Flying Dark Confidant Rarity: Mythic Rare TYPE: Creature SUBTYPE: Human Wizard CMC: 2 Mana cost: USD: $4.20 EUR: 4.66 TIX: 0.03 EDHREC RANK: 1253 (2/1) At the beginning of your upkeep, reveal the top card of your library and put that card into your hand

They were referred to generally by acronyms to keep their profiles relatively low