Zerg vs Terran
Open up as normal, going into a double extractor trick.
Lair when pool finishes
Make queen from nat as soon as 150 minerals stockpiles
If a fast attack is scouted throw down 1-2 spine crawlers, else continue with drone and minimal ling production.
Based on scout, upon lair transition to spire tech, Infestor tech, roach tech, hydra tech or banelings. Both a fast lair and fast expansion also quick switches to these entirely based on what feels most appropriate at the time.
If Infestor, a cool transition to mutalisk infestor ling is possible by a quick third for the gas. this allows maximum agression while also expanding to a third quickly.
That is my random blog about my favorite ZvT opening and transitions. Thank you for reading.