Overkill

Overkill, in Gameplay has two meanings:

First Meaning
Excess usage of Creatures or Spells, generally when one is about to win but makes a move that is excess and is not needed generally to humiliate the opponent even more. For example, One might be winning with an Eternal Meteor Kaiser in the battle zone giving all your creatures Speed Attacker, then summons Überdragon Bajulaterra in order to remove all his Mana. This is usually considered undesireable and is almost the same as Stalling the timer in official events.