pokemon ho oh gx card Ho-Oh 21 Burning Shadows Extended Art Display Cases 20 Retreat Cost Ho-Oh GX 21/147 Holo Ultra

A reasonable approximation of the expected power of gold cards is that your 2nd colour of mana adds about a 1/3rd of a mana, the 3rd colour adds 2/3rds of a mana and the fourth is a whole extra mana

The card is a subset tutor (of sorts) from a very unpopular set, so I like it as a low-risk long-term hold

The way it works is simple: if your opponent has a Pokmon on their bench that has taken damage, you can swap it to the active slot

To be fair this does work in the TCG to some extent, just compare the current price for a Secret Illustration Rare Iono to the price one commanded at release date (or if you want to be completely insane, during prereleases)