55 cards where the card is tagged “mana-storage”

Black Mana Battery (Fourth Edition #298)
Blue Mana Battery (Fourth Edition #300)
Bootleggers' Stash (Streets of New Capenna #134)
Bottomless Vault (Fifth Edition #411)
Calciform Pools (Time Spiral Remastered #275)
City of Shadows (Masters Edition III #206)
Coalition Relic (Dominaria United Commander #180)
Collector's Vault (Wilds of Eldraine #244)
Crucible of the Spirit Dragon (Forgotten Realms Commander #231)
Deadeye Plunderers (Ixalan #220)
Diamond Kaleidoscope (Visions #143)
Dreadship Reef (Time Spiral Remastered #276)
Dwarven Hold (Fifth Edition #414)
Fangorn, Tree Shepherd (The Lord of the Rings: Tales of Middle-earth #166)
Forsworn Paladin (Adventures in the Forgotten Realms #104)
Fountain of Cho (Mercadian Masques #317)
Fungal Reaches (Time Spiral Remastered #279)
Gemstone Array (Fifth Dawn #124)
Green Mana Battery (Fourth Edition #323)
Heap Gate (Commander Legends: Battle for Baldur's Gate #354)
Hollow Trees (Fifth Edition #418)
Horizon Stone (Commander Legends #315)
Icatian Store (Fifth Edition #419)
Iceberg (Masters Edition II #49)
Ice Cauldron (Masters Edition IV #206)
Jeweled Amulet (Masters Edition II #212)
Jungle Patrol (Mirage #223)
Kruphix, God of Horizons (Journey into Nyx #152)
Kyren Toy (Mercadian Masques #303)
Leyline Tyrant (Zendikar Rising #147)
Luck Bobblehead (Fallout #135)
Mage-Ring Network (Commander Masters #1009)
Mana Bloom (Return to Ravnica #130)
Mercadian Bazaar (Mercadian Masques #321)
Mines of Moria (The Lord of the Rings: Tales of Middle-earth #257)
Mirrodin's Core (Jumpstart #492)
Molten Slagheap (Time Spiral Remastered #282)
Omnath, Locus of All (March of the Machine #249)
Omnath, Locus of Mana (Commander Masters #310)
Pentad Prism (Double Masters #281)
Red Mana Battery (Fourth Edition #343)
Redrock Sentinel (Outlaws of Thunder Junction #247)
Rushwood Grove (Mercadian Masques #325)
Saltcrusted Steppe (Time Spiral Remastered #283)
Sand Silos (Fifth Edition #423)
Saprazzan Cove (Mercadian Masques #327)
Slivdrazi Monstrosity (Mystery Booster Playtest Cards 2021 #102)
Spawnsire of Ulamog (Rise of the Eldrazi #11)
Subterranean Hangar (Mercadian Masques #329)
Throne of Makindi (Zendikar Rising #265)
Treasure Dredger (Outlaws of Thunder Junction #110)
Upwelling (Tenth Edition #306)
Vault Robber (Kaldheim #158)
Ventifact Bottle (Mirage #323)
White Mana Battery (Fourth Edition #357)

The message was clear to Sorin—time to search for something else.