mtg shadowmoor cards Gravelgill Axeshark [Shadowmoor] Merfolk Rogue Shadowmoor Fat Pack Art Print

Commanders who want to remove opponents libraries can come in a few different flavors

The secret of Strixhaven itself

Blue fetches are often the most in need, and dropping the price of this one is pretty sweet

However, you're still the player that cast Hellish Rebuke, so the ability will trigger whenever one of those permanents deals damage to you, not the player who controlled Hellish Rebuke as it resolved

Oh and for all ten of you Kamigawa weirdos, its Arcane, which is cute

Cards like Watcher of the Spheres and Warden of Evos Isle reduce the cost of all flying creatures you would cast, including your commander, reducing the hit that Commander Taxes can cause