Its what is winning isnt necessarily a convincing argument on its own, but youd have to try really hard to get me away from registering a pile of basic Forests any time you cant fetch a basic land off of your opponents Ghost Quarter, Field of Ruin, or Path to Exile is enough of a disaster that I think you need a really good reason to play a second color right now, especially considering the basic Forests also help insulate you against the Blood Moons out of decks like Mardu Pyromancer
Meanwhile, Archmage of Runes not only draws cards the same way, but it also makes your spells cheaper, turning every cantrip into a little engine
The abundance of creatures in Commander games means that Vanquish the Horde will often cost a paltry two-mana, most likely leaving its caster with plenty left over to take advantage of the empty, newly vanquished battlefield
The funniest interaction I got in mind is playing it for 1 + 1 with Thalia, Guardian of Thraben on the board, and sweeping basically all the creatures from Human deck
It's still a fine card a budget replacement for the better tutors (Demonic Tutor)
After being dealt damage, if they would die for any reason that turn, they'll be exiled instead
