Because it was a trading card game, it was deemed too complex for the printer we were going to use for games at The Game Keeper
A planeswalker like Teferi, Who Slows the Sunset gains you some life with the plus, and theyll try to attack it
That does not mean, as we have explained before, that the metagame is static, but if you invested in Regidrago when it first came out (like 4 or 5 years ago), you would have had in your position a tier 1 or 1.5 deck ever since
Bonus points for it counting any treasures/clues/foods etc that opponents crack in response to this going off
Conveniently, many of these creatures are cheap, so they can curve into the likes of Armorcraft Judge and Patron of the Valiant
Rare single card perfect for collectors and players seeking strategic synergy with life gain