In Commander, that trigger happens a lot
In EDH, think Senseis Divining Top, Scroll Rack, and the many cards that let you scry as part of spell resolution
Current Meta Snapshot Direct answer : Amethyst/Steel is the most common Steel pairing right now, while Sapphire/Steel Allies is trending up
Your opponents want to ensure each player gets at least one vote so they dont get a free permanent on the field, but you also want to make sure nobody draws too many cards
Since white decks are full of good creatures and spot removal, its hard to take the monarch back from a white player once they have it
You've got your early game coverage with some nice Steel powerhouses, on top of coverage for evasives, some of the best songs, and several options for card draw, as Amethyst is known for