Originally Posted by
Demnchi
Disable and Poison are Negative Effects and aren't considered passives, so they would be unaffected by Groundshift. The Hunter Ally cost reduction is an active effect sourced to Skervox himself, which Groundshift does not interact with since it only interacts with allies. Unless I'm forgetting someone, the only heroes whos abilities would be affected by Groundshift are Tala (Protector) and Moonstalker (Stealth). Even still, that's only because the hero gave the ally itself the passive.
A good rule of thumb(s) for what is and isn't a passive would be something like this:
1. A Keyword on an ally that is not a negative effect (eg. Protector, Stealth, Hidden, Defender, and Haste are all passives)
2. Any ability that comes from an ally that does not have a Resource or Shadow Energy cost (eg. Aldon's +1 attack buff is a Passive, while Marshland Sentinal's 0-attack ability is an Activated ability)