Parsnik is a good all rounder card who can paralyze a selected enemy monster when placed on the field, preventing the opponent from using that monster for the following turn (unless it is Silenced or cured by cards like Asriel). However, if there is no enemy monster, this ability will instead go to waste.
Ever since Beta 26.0, if you target an enemy monster already paralyzed, it will also deal 2 DMG to it.
Paralyzed monsters can still deal damage if attacked and their passive abilities still work. Silencing a paralyzed monster will remove the paralysis and make it able to attack if it should be able to.
Best used in a Patience deck due to their passive and spells working with paralysis.