Evilswarm Exciton Knight [LVAL-EN056] Secret Rare P-257 put a -1 [Defense] counter

put a -1 [Defense] counter on it when the combat chain closes

this becomes an Illusionist ally with phantasm

destroy Halo of Illumination: Put a card from your hand into your hero's soul

) You can only activate 1 "The Book of the Law" per turn

Evilswarm Exciton Knight [LVAL-EN056] Secret Rare P-257 put a -1 [Defense] counterSet: Legacy of the Valiant Card type: Xyz Effect Monster Rarity: Secret Rare Attack: 1900 Defense: 0 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 their side of the field than you do: You can detach 1 Xyz Material from this card; destroy all other cards on the field, also your opponent takes no further damage this turn (this is a Quick Effect).