Overextending

Overextending is the process of a player filling up his Monster Card Zones or Spell/Trap Zones, or both, with 3 or more cards, leaving the player at risk from cards suck as Dark Hole and Heavy Storm.

Cards exist to specfically punish the player for overextending. Mirror Force is one such card, designed to punish players who field too many attacking monsters. Cards like Heavy Storm also exist to punish players who field too many Spell and/or Trap Cards, although cards like Magic Jammer and Judgment of Anubis can serve to protect against this.