Template:Sonya Shadowdancer strategy
Sonya's effect is useful mainly as a combo enabler and also to return minions with useful battlecries to your hand at a discount. It works well with cards like 
SI:7 Agent, 
Bonemare and 
Vilespine Slayer to pull off cheaper combos. Using a Stonetusk Boar can also pull of interesting combos with Edwin VanCleef as an easy way to clear the board.
She works best when played for tempo rather than as a combo piece. If you have minions on board and the opponent plays a bigger minion, you can trade your minions on board with the opponent's minions to create 1/1 copies of them. Her strength comes in being able to trade a minion with a strong Battlecry already on board like Prince Keleseth to reuse their effects for a much smaller cost.
Sonya is also particularly good in Quest Rogue as she allows you to complete your quest even faster with cards like Patches and Fire Fly. With a 1-mana Charge minion like Stonetusk Boar, it guarantees you complete the quest by turn 8.
Another application for Sonya is in Jade Rogue and 
Pogo-Hopper decks, who helps generate more copies of those minions to ramp up their stats.
It can be used with 
Wildpaw Gnoll that has been discounted from 
Maestra of the Masquerade to be able to have a reliable board clear due to having no mana cost with Rush. An alternative is to have 
Mechwarper and Skaterbot to do the same.
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