Right now, the etched foil is best put in Commander decks that can use Ob Nixilis last ability early by sacrificing a big creature and Cube formats where it may replace Daretti, Ingenious Iconoclast
Demonic Tutors always an option, but these styles of deck get to play rarely-used tutors like Infernal Tutor and March of Burgeoning Life to great effect
Some of the morphs like Vesuvan Shapeshifter, Willbender, and Nantuko Vigilante have value, but youd really want to move this into being a token and control deck so that your commander doesnt exile so much of your stuff
Do you have a fresh build for them in any Constructed format

Alela, Artful Provocateur Aminatou, Veil Piercer Aminatou, the Fateshifter Arna Kennerd, Skycaptain Arsenal Thresher Bane, Lord of Darkness Birth of the Imperium Brilliant Ultimatum Chromium Chromium, the Mutable Dakkon Blackblade Dakkon, Shadow Slayer Deny the Witch Diviner of Fates Dromar's Charm Dromar, the Banisher Elenda and Azor Enigma Sphinx Eriette, the Beguiler Ertai, the Corrupted Esper Charm Esper Sojourners Esper Stormblade Etherwrought Page G'raha Tia, Scion Reborn Halfdane Inquisitor Greyfax Kamiz, Obscura Oculus Lady Evangela Magister Sphinx Marneus Calgar Merieke Ri Berit Narod, the Beige Flower (playtest) Nevinyrral, Urborg Tyrant Nihiloor Nimble Larcenist Noctis, Heir Apparent Noctis, Prince of Lucis Obscura Ascendancy Obscura Charm Obscura Confluence Obscura Interceptor Oloro, Ageless Ascetic Punish Ignorance Queza, Augur of Agonies Raffine, Scheming Seer Ratonhnhak:ton Saruman of Many Colors Sefris of the Hidden Ways Sen Triplets Sharuum the Hegemon Shattered Seraph Sidar Jabari of Zhalfir Sludge Strider Soundwave, Sonic Spy Soundwave, Superior Captain Sphinx Sovereign Sphinx of the Steel Wind Sydri, Galvanic Genius Temmet, Naktamun's Will The Destined Warrior The Ever-Changing 'Dane The Flesh Is Weak The Master of Keys Thopter Foundry Tivit, Seller of Secrets Toluz, Clever Conductor Tower Gargoyle Urza, Chief Artificer Varina, Lich Queen Void Rend Wandering Mage
