Swarm

From Yu-Gi-Oh!

Swarming is the process of rapidly Summoning monsters to your side of the field in an attempt to overwhelm your opponent. "Double Summon", "Ultimate Offering", "Cyber Dragon", "The Tricky", and "Gilasaurus" are examples of cards with swarm capabilities. The Six Samurai Archetype is designed to swarm the field to gain power and effects.

Anti-Swarm refers to cards that help to counteract Swarming. "Mirror Force", "Lightning Vortex" and "Torrential Tribute" are considered Anti-Swarm cards. Ultimate Tyranno can aid in defeating weak swarm monsters on the field, since it has a "Continuous" ability which allows it to attack all monsters on your opponent's side of the field. However, provided that the swarm monsters are strong enough, "Covering Fire" can land anti-swarm monsters into a near-disadvantage.

Sometimes swarming can lead to overextending.