Template:Archwitch Willow strategy
Willow's effect is quite strong, allowing players to pay just 8 mana for two demons- in most cases this will be stellar value. Currently in Standard there aren't many large demons Warlock wants to be cheating out, but there are a few like 
Fel Lord Betrug or 
Enhanced Dreadlord. You can also use Willow to summon smaller demons like Aranasi Broodmother and it would still be good value thanks to the fairly large body Willow provides alongside her effect.
Wild offers better demons for Warlock to use, like 
Mal'Ganis, 
Voidlord, or 
Doomguard. She also has great synergy with 
Bloodreaver Gul'dan - you can play her on turn 8-9 to pressure your opponent to clear your demons and then play Bloodreaver Gul'dan on turn 10 to revive them.
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