That means they work with tiered spells and spells with flashback, such as Ice Magic and Laughing Mad
Traditional MTG dictates that pump spells are very prone to succumbing to 2-in-1 or even 3-in-1 advantage loss
I'm split on if you should disclose it
The first of them was Sliver Queen, but the second one didn't show up until Apocalypse a whole three years later with Cromat
The interesting thing comes when you start targeting your other creatures with auras and even mutate creatures

Acid Web Spider Ademi of the Silkchutes Alenni, Brood Recruiter Alessos and Pras, Acrobats Amazing Spider-Girl Amazing Spider-Man Ancient Spider Aquastrand Spider Arachne, Psionic Weaver Arachnoid Arachnus Spinner Arasta of the Endless Web Arasta of the Endless Web Araa, Heart of the Spider Archweaver Argyr, Tidal Spinner Astonishing Spider-Man Blightwidow Borys, the Spider Rider Brood Weaver Broodspinner Cactarantula Canoptek Spyder Canopy Spider Canyon Crawler Chainweb Aracnir Chizak, Apex Arachnosaur Cirina Bargainspinner Copper Longlegs Cosmic Spider-Man Cren of the Spider Brood Darval, Whose Web Protects Deadly Recluse Diligent Webkeepers Doom Weaver Dragonlair Spider Drider Egrix the Bile Bulwark Ember Weaver Ettercap Ezekiel Sims, Spider-Totem Fateweaver Fizik, Etherium Mechanic Frostweb Spider Funnel-Web Recluse Ghost-Spider Ghost-Spider, Gwen Stacy Giant Spider Giant Trap Door Spider Glint Weaver Gloomwidow Gloria, the Great Armorer Glowstone Recluse Gnottvold Recluse Goliath Spider Grappler Spider Graverobber Spider Gwenom, Remorseless Hatchery Spider Hitchclaw Recluse Hoarding Recluse Iron Spider, Stark Upgrade Ishkanah, Grafwidow Janai and Hoppy, Roofskippers Jungle Weaver Juvenile Gloomwidow Kavaero, Mind-Bitten Kessig Recluse Kivni, Orb Weaver Kraza, the Swarm as One Kroble, Envoy of the Bog Kumonosu, the Watchful
