every mewtwo pokemon card - ex 058/182 - Paradox Rift - Tera Double Rare Mewtwo from XY Mewtwo the End Incarnated VMAX

The second is with phasing effects like Teferi's Veil

Self-Bounce a Creatures (16) Entity Tracker x2 Fear of Isolation x4 Nurturing Pixie x4 Optimistic Scavenger x4 Spyglass Siren x2 Instants (6) Cut Down Go for the Throat This Town Ain't Big Enough x4 Enchantments (15) Hopeless Nightmare x4 Nowhere to Run x4 Sheltered by Ghosts x3 Stormchaser's Talent x4 Lands (23) Adarkar Wastes x2 Concealed Courtyard x4 Darkslick Shores x4 Gloomlake Verge x2 Island x2 Meticulous Archive x3 Seachrome Coast x4 Underground River x2 Sideboard (15) Destroy Evil x2 Kaito, Bane of Nightmares x2 Loran of the Third Path Pest Control x2 Rest in Peace x3 Split Up Sun-Blessed Healer x2 Tithing Blade x2 I love a deck that turns drawbacks into advantages

To be fair, Hallowed Fountain is the only serialized Shock Land we can find around the most expensive cards on Cardmarket

Goldspan Dragon doesn't double your Treasure, but it does double their mana production

While significantly more expensive than the best Clone variants, putting good clone targets into your graveyard is usually significantly cheaper than getting them onto the battlefield, and its far less likely to be stuck without targets