The Tyrant was out of place in Gatecrash , a decidedly non-artifact focused set, and so it flew under the radar for a while before folks realized oh, wait, its incredibly easy to get 20 artifacts under your control in any Eternal format. With two previous encore performances in Commander 2016 and Commander 2019 , Hellkite Tyrants low print run has meant its kept a price tag that fluctuates for years
This being said, the expected value is probably better than you think, so if you are feeling a bit lucky, opening a box of Masters 25 isn't a wholly losing proposition from a financial perspective
95% of the time, the triggered ability probably isnt worth a removal spell thats going to be better sent towards Rhystic Study or Smothering Tithe, but once enough cards have been exiled, the risk from rolling a 20 is going to weigh on your opponents
And Then Along Came Zeus gives you the option to do five damage to a character or location, giving you flexibility when dealing with lore threats on your opponents board
This type of deck loves a little self-mill to get it going, while also having plenty of ramp to be able to recast those cards