Like most Pokmon cards, the value of Yanmega depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Unified Minds)
These cards are more than just collectibles they're part of Pokmon history and represent a unique era in the trading card world
As these are matte sleeves, they have a frosted front and will dull the colours of cards as well as dull the shine of foils
RRR: Target creature gets +3/+0 until end of turn
You might even want to shut off your own Abilities to get through the Alolan Vulpix VSTARs attack so you can score an OHKO
When the graveyard is irrelevant, the card falls back on its high floor: three mana, four power, four toughness