When Carapace Queen swarms, you resolve the effect from the Husk Mat that corresponds to the total number of husks in play. You only resolve one effect, you do not resolve every effect below the number of husks in play.
Example: There are 5 husks in play and Carapace Queen swarms. Resolve the 4-6 Husk effect (Any player discards a prepped spell. Place two husks into play). You do not resolve the 0-3 Husk effect (Place four husks into play).
