4 cards are almost always common, and 3 cards are almost always uncommon, so its possible that the remaining 2 cards could also be rare
Ooze Flux falls squarely into this camp

Jhoira of the Ghitu Jhoira of the Ghitu | Illustration by Kev Walker Commander (1) Creature (39) Rift Elemental Sphinx of the Second Sun Wild-Magic Sorcerer Timebender Artisan of Kozilek Etali, Primal Storm Jhoira's Timebug Deep-Sea Kraken Nezahal, Primal Tide Desolation Twin Inkwell Leviathan Ulamog's Crusher Stormtide Leviathan Bearer of the Heavens Breaker of Armies Diluvian Primordial Archetype of Imagination Charmbreaker Devils Mercurial Chemister Meteor Golem Detritivore Scholar of the Lost Trove Tromokratis Tyrant of Discord Scourge of Fleets Akroma, Angel of Fury Niv-Mizzet, Dracogenius Tidal Force Gargadon Palladium Myr Brinelin, the Moon Kraken Dragon Mage Pathrazer of Ulamog Arcanis the Omnipotent Molten Primordial Ovika, Enigma Goliath Keeper of Secrets Niv-Mizzet, the Firemind Niv-Mizzet, Parun Instant (14) Fury Charm Clockspinning Timecrafting Fact or Fiction Rewind Unwind Opportunity Aetherize Mental Journey Creative Outburst Izzet Charm Teach by Example Scour from Existence Wild Ricochet Sorcery (7) All of History, All at Once Aminatou's Augury Inspiring Refrain Elemental Masterpiece Ravenform Boon of the Wish-Giver Mnemonic Deluge Enchantment (1) Artifact (5) Sol Talisman Mind Stone Commander's Sphere God-Pharaoh's Statue Izzet Locket Land (33) Swiftwater Cliffs Izzet Boilerworks Command Tower Evolving Wilds Izzet Guildgate Highland Lake Terramorphic Expanse Temple of Epiphany Silverbluff Bridge Prismari Campus Mountain x11 Island x11 Myriad Landscape Jhoira of the Ghitus ability to suspend any card gives you a lot of fun options when it comes to deckbuilding

Sometimes these give you actual digital cards, other times they include unique card styles, sleeves, and more