Princess Plant (Adventure Time 2) and discard One-Shots

[Cammagno]

Some One-Shot Items (for example Princess Plant from Adventure Time 2) say "discard to …" get their effect.
Is this "discard" correct for One-Shots, or it should say "play"?

There are other One-Shots (for example Bezoar, Fawkes the Phoenix and Felix Felicis from Harry Potter) that has a normal "play" effect (a bonus to either side) plus a "discard" one, so I can assume that in those cases its purposely differentiated, but Princess Plant has no "play" effect (but it says "play at any time" at the top, making even more confusion in my mind).

I'm asking because it's not the exactly same, some cards prevent the player from playing cards but not from discarding them (see for example this FAQ)