[1] Technically, there are ways to "refresh" the timestamp of a permanent, so the order they entered the battlefield is not always the same as their timestamp order, but none of those ways applies in the situation as described.
for example, after a Tail Whip, Raticate threatens a paralyzed Starmie with a KO from Body Slam + Hyper Beam, and a paralyzed Alakazam with a KO from Hyper Beam
PSA is of course the market leader, and in theory adds the most value to your cards
Power and Terror (2U70) offers a site-agnostic cost-reduction, which of course can allow you to play this scourge more frequently
The separation of keyword abilities from keyword actions (a change that came about recently) was made because the two groupings worked differently even though both shared the definition I gave above
Flame Jab: solid in Limited