mtg arcades commander deck the Strategist Arcades, the Strategist WALLS TOUGHNESS

As for Runehorn Hellkite, I've never met a Wheel of Fortune I didn't like, and even though this one is pretty expensive at six mana, it also generates random value from the graveyard if you discard it to something like Survival of the Fittest and is uncounterable and instant speed

These are typically very old cards because age tends to correlate with scarcity, especially with the Reserved List hanging around

If the enchanted creature is no longer on the battlefield when Penumbra Umbra's second ability resolves, use its copiable values as it last existed on the battlefield

Some sub-themes include: the synergy between Huey, Dewey, and Louie, Donald Duck's nephews from Ducktales