Hakkar, the Soulflayer thirsts for blood and hungers for souls!
During the late game our quest will be completed. This is where Seance really shines. 2 more Amara, Warden of Hope? Yes, please. Zerek's Cloning Gallery will bring in a reaaaaaaally nasty board full of dangerous deathrattles. Having a Spirit of the Dead on board before filling it with clones will provide huge late game value.
Once Hakkar, the Soulflayer (or a copy of him) has triggered, Spirit of the Dead will be your best friend. Filling your deck with copys of your minions will shrink the odds of drawing Corrupted Blood.
Hope you enjoy watching your opponent filling his deck with Corrupted Blood while constantly setting your health to 40 and summoning hoards of high value minons for 1!