Individually these effects are marginal: but combined they form a card that was so good, many non-red blue base decks started playing red just to get it (plus Flametongue Kavu, to be perfectly fair)
Pokemon TCG fans are pulling Full Alternate Art cards from Advent Calendars In a recent post shared by rtgeary on Reddit, the Pokemon TCG collector shows their first booster opening with a comment that reads, Did I win the lottery in my countdown calendar? The image shows the extremely rare and popular Umbreon VMAX Alternate Full Art card
Formats like Draft and Sealed, where you build your deck on the spot, come to mind
The key lies in older, rarer, out-of-print cards you wont find in bulk on eBay and gem mint cards worthy of a display case
Jigglypuff PA-22 (Promo-A) Wigglytuff ex Vileplume Hypno Frosmoth Before the Venusaur Drop Event, only four cards could apply Asleep: Wigglytuff ex, Vileplume, Hypno, and Frosmoth