>they have no monsters
>reveal any number of motor worm monsters in hand
Nekroz of Extinction
WATER | Dragon | Level 10 | Ritual | Effect
You can Ritual Summon this card with any "Nekroz" Ritual Spell. When this card is Ritual Summoned: Destroy monsters on the field up to the number of monsters used for this card's Ritual Summon, then, if 3 or more of your monsters were destroyed by this effect, Special Summon 1 "Nekroz" Ritual Monster from your GY, ignoring its summoning conditions. You can only use this effect of "Nekroz of Extinction" once per turn.