Kaalia herself is relatively weak all things considered, shes a four-mana 2/2 creature with flying
After the Bannings I expected Amulet Bloom to go
Authentication is part of the grading process, so if PSA has graded your card, that means its genuine
This is an inherently powerful card its just also very narrow

Adagia, Windswept Bastion Adarkar Windform Adeliz, the Cinder Wind Aether Tradewinds Aetherwind Basker Akim, the Soaring Wind Aryel, Knight of Windgrace Auriok Windwalker Aven Wind Guide Aven Wind Mage Aven Windreader Bill Ferny, Bree Swindler Blessed Wind Boarded Window Borne Upon a Wind Borrowing the East Wind Countervailing Winds Crosswinds Cursed Windbreaker Death Wind Denying Wind Djinni Windseer Downwind Ambusher Dreamwinder Dwindle East Wind Avatar Eidolon of Astral Winds Favorable Winds Freewind Equenaut Freewind Falcon Freyalise's Winds Frostwind Invoker Galewind Moose Gust of Wind Gwaihir the Windlord Haunting Wind Heidar, Rimewind Master Hero of the Winds Higure, the Still Wind Higure, the Still Wind Avatar Honden of Seeing Winds Icewind Elemental Icewind Stalwart Invoke the Winds Jeskai Windscout Junk Winder Just the Wind Kastral, the Windcrested Katabatic Winds Kykar, Wind's Fury Lord Windgrace Maddening Wind Master of Winds Merfolk Windrobber Mu Yanling, Celestial Wind Mu Yanling, Wind Rider Myojin of Seeing Winds Nightwind Glider North Wind Avatar One With the Wind Plague Wind Release to the Wind Revealing Wind Rewind Rimewind Cryomancer Rimewind Taskmage Scatter to the Winds Scorching Winds Searing Wind Second Wind Shredding Winds Sidewinder Naga

At other given times, there might be no viable sellers of specific cards