Chromatic Lantern, Commander's Sphere - Your commander is 3-mana, so it is nice to have 2-mana ramp so you can still play your commander on curve
Plus, it mitigates the downside of symmetric discard effects like Liliana of the Veils +1 ability because youll have to discard but often get more cards than you discarded
The power here lies in the flexibility: This can be used as a surgical removal tool against key creatures in play, a sacrifice outlet for creatures with powerful die triggers, or a means of finishing off opponents by cashing in expensive cards
Tracked Commander games behind the impact figures below
You can't make choices or decisions for that player that aren't called for by the game rules or by any cards, permanents, spells, abilities, and so on