Unravel the Aether and Deglamer have seen a ton of sideboard play over the years for how efficiently and effectively they answer problematic enchantments
In a format where words like redundancy or synergy get thrown around a lot, its quite weird that this one isnt on people's minds when building for hand knowledge
Astarion, The Decadent A Temptation To Be Sure This guy knows exactly how seductive the life of a Vampire is and as a commander, Astarion, the Decadent helps keep your life total high by drinking deep in the carnage of the battlefield
Its the very definition of flexibility, and, perhaps more importantly, look at that art
Granted, it does nothing when youre really far behind or have no creatures, but it enables enough synergies that I think it balances out to a very powerful card in a lot of situations