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
The Aetherspark and Mox Jasper do exciting things, but neither card is even remotely viable in eternal formats like Legacy and Vintage

Most valuable cards in Final Fantasy View the full price guide $6,175.00 Traveling Chocobo Final Fantasy $2,116.76 Traveling Chocobo Final Fantasy $1,962.72 Traveling Chocobo Final Fantasy $1,751.22 Traveling Chocobo Final Fantasy $1,709.36 Traveling Chocobo Final Fantasy $485.44 Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel Final Fantasy $259.23 Cloud, Midgar Mercenary Final Fantasy $151.62 Yuna, Hope of Spira Final Fantasy More cards by Rorubei $320.00 Horobi, Death's Wail Multiverse Legends $109.95 Lord of Atlantis 30th Anniversary History Promos $71.54 Emet-Selch, Unsundered // Hades, Sorcerer of Eld Final Fantasy $55.00 Lord of Atlantis 30th Anniversary History Promos $36.36 Snap Secret Lair Drop $34.33 Higure, the Still Wind Secret Lair Drop $28.51 Brain Freeze Secret Lair Drop $25.00 Monk MOM Japanese Promo Tokens SetFinal Fantasy Most valuableTop 100 Magic: The Gathering cards You might also like...

Rather than being a one-turn blowout card, Festival is more of an ongoing value engine
Rishadan Dockhand does something similar, but of the one-mana creatures, Tide Shaper is the real prize
Between the two, however, most of us are probably just happy to open something valuable