Cheapest priced copy (Unfinity): $0.35 at Card Kingdom, near mint, their price list as of .
Bioluminary 
Creature — Merfolk Performer · 1/3 · Uncommon · Unfinity · #38
Whenever Bioluminary deals combat damage to a player, you get {TK}{TK}, then you may put a sticker on a nonland permanent you own.
Legal inCommander
Banned inLegacyVintage
Not legal inBrawlStandardPioneerModernPauper