Be wary of using this effect on Grade 2 Units, as your opponent can use them to Intercept and thus waste this skill. It might be worth using on a valuable Unit such as Silent Tom if you want to force its retirement.
This card does not require a Megacolony Vanguard, so it can be splashed to another deck along with similar Units like Karma Queen and Hell Spider, preferably Nova Grappler, which can unflip the damage used.
Force a Grade 1 booster or Grade 3 attacking Unit to remain rested, in order to either cause the opponent to retire them and call a new one, or drastically reduce their attacking power next turn.
This Unit's effect won't force a standing Unit to rest. You also need to be wary of damage checked Stand triggers.