Evilswarm Exciton Knight (BLC1-EN015) - Battles of Legend: Chapter 1 1st Edition

2 Level 4 monsters
Once per chain, during your Main Phase or your opponent's Battle Phase, if your opponent has more total cards in their hand and field than you do (Quick Effect): You can detach 1 material from this card; destroy all other cards on the field, also your opponent takes no further damage this turn.