Keep dropping. Stephano may be able to shut down your drops with ling patrols and well placed infestors, but I promise you the average ladder master wont. If you dont succeed straight away just keep dropping, you will eventually hit the jackpot and kill like 20 drones.
Also be really careful taking a third, as some variations of this style involves cutting some drones and getting like 70 upgraded ling on the field to completely annihilate terran when he moves out to push/take third, keep a close eye on that ling/drone count
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