The CMC restriction ensures that he doesnt scale too well to Commander, and only triggering off of legends, artifacts and sagas means that its really hard to build around triggering his ability consistently while also having relevant creatures to return
This high up, we'll go strictly by Whoever gets the most bans, wins. You can play Timetwister in Vintage (even if it's restricted) and Commander, but Yawgmoth's Bargain is strictly Vintage-only and one of Magic's best black enchantments ever
While these are extremely plentiful when in print (you can easily walk down to your friendly local game store and buy one), securing the best possible price in recent years tends to require working with a distributor or waiting for a major sale on Amazon
This is something that players will do in a duel
Commanding Conclusion Bartolom del Presidio | Illustration by Randy Gallegos The Lost Caverns of Ixalan brought us back to a plane made iconic for its inclusion of pirates and dinosaurs into the official lore of Magic as cards we could play with instead of seeing referenced