using buff comparison

It seemed when the new patch came out that everyone was talking about how the buff comparions condition would let you pick units getting hit by an ability. How is it possible useful? The only comparison is with a buff and a buff variable no event response like 'effect that unit is acting out as a result of ability' So why would this even be added if we still have to do checking for status effects the old fashion way?

Well it's useful, for example it can be used to make a unit with poison automatically poison all targets in range.

E On attack
A Attack (Random Unit from (Enemy Units in range without poison buff))


Another system is for custom auras:
Pick every unit with specific buff and do whatever

I'm not entirely sure what you want it to do, but for me it's plenty useful.