Much like the Artifact, Beseech the Mirror is playable in multiple MTG formats that range from Standard and Pioneer to Commander and Vintage
Next, I want to talk about a removal spell that in the late game could be the finisher you need to win
The closest card to a nonland gate is Omo, Queen of Vesuva, which can make nongate lands into gates
Rubinia Soulsinger You know what
It has initiative, supports the party mechanic, can protect your creatures, and casually has the explore mechanic tacked onto the end
It gets even sillier with blink effects like Eldrazi Displacer, and could easily be a win condition if built around, though it remains to be seen if it's too slow on average compared to the Modern format's current speed