It can be found in the Extradimensional Crisis pack from the ExtradimensionalCrisis set
Bloodboiler does have a meaningful impact on combat, so it sees play in Commander Dwarf kindred decks that are most often led by Magda, Brazen Outlaw
These older cards aren't too numerous, so a well-preserved copy could be worth several hundred dollars
And yes, thats a rare 6/6 vanilla creature for 7 mana
On average, there's only one special expansion per card series with Shiny Pokmon cards, which makes them feel like much more of an event even though they use generic-looking card art
However, in June 2025 we got an unexpected wave of bans in what WotC called its "mid-year ban announcement" - followed by a single card 'emergency' ban in March 2026