In EDH, think Senseis Divining Top, Scroll Rack, and the many cards that let you scry as part of spell resolution
Late in each game, there are a few interesting choices while trying to mix scoring points on quests with eliminating some of my own characters to slow down a massive scoring engine across the table
Current Meta Snapshot Direct answer : Amethyst/Steel is the most common Steel pairing right now, while Sapphire/Steel Allies is trending up
You may remove stun counters from permanents you control as well as ones your opponents control
If you do, draw X cards
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