There were plenty more cards mentioned as well
Magic: The Gathering | Marvel's Spider-Man Details SPE Expansion Symbol MAR Expansion Symbol Magic: The Gathering | Marvel's Spider-Man Set Code : SPM Magic: The Gathering | Marvel's Spider-Man Eternal-Legal Set Codes : SPE and MAR Legality : Magic: The Gathering | Marvel's Spider-Man (SPM) is a Standard-legal set
Aside from that, the following cards mention oozes in their rules text, including a few token generators: Convert to Slime Gelatinous Genesis Corrupted Zendikon Gutter Grime March of the World Ooze Miming Slime Mystic Genesis Ooze Flux Ooze Garden Slime Against Humanity Slime Molding Gutter Grime is a strong enchantment for a typal build, but Slime Against Humanity is fun since it lets you break deckbuilding rules
Beyond Rin and Seri, each other extended-art card can be found in Collector Boosters in both foil and non-foil
But they'll have to fly through a war zone to get there.
For example, all of the original dual lands did not have price data attached when I downloaded the info from Scryfalls API
