"Sylvanas and the Banshee Queen card back can be purchased as part of the Sylvanas Windrunner Hero Set for $9.99 or 1500 gold from March 25, 2021 to April 5, 2021. She was previously obtainable for a limited time in Shop, from December 10th, 2019 to January 5th, 2020." https://hearthstone.fandom.com/wiki/Sylvanas_Windrunner_(hero)
3
"Sylvanas and the Banshee Queen card back can be purchased as part of the Sylvanas Windrunner Hero Set for $9.99 or 1500 gold from March 25, 2021 to April 5, 2021. She was previously obtainable for a limited time in Shop, from December 10th, 2019 to January 5th, 2020." https://hearthstone.fandom.com/wiki/Sylvanas_Windrunner_(hero)
3
Dude, you're the best, it got me from Diamond 5 to Legend for the first time ever...