The card shown in this dream fragment is the Hearthstone card Ancestral Spirit captioned as "Assembled Shaman". Each of the cards used in Ysera's round have titles which similarly match in enumeration and initial letters to Hearthstone cards as displayed and ordered in game.

• Cannery → Crackle
• Lost Skull → Lava Shock
• Replication → Reincarnate
• Wanderer → Windfury
• Formulating Teams → Flametongue Totem
• Trail Goods → Totem Golem
• Vagabond Tours → Vitality Totem
• Worrying Ziggurats → Whirling Zap-o-matic
• Provision → Powermace
• Emergency Deportation → Elemental Destruction
• Fun Sized → Far Sight
• Field Scribe → Feral Spirit
• Haddock Walk → Healing Wave
• HEX [missing]
• Life Braid → Lava Burst
• Luminance Shift → Lightning Storm

The Hearthstone card that is missing from this sequence is HEX, and this is the answer for this dream fragment.