|Number HM91: Thunderspark Dragon Wyrm|
|Type(s)||[ Wyrm/Xyz/Effect ]|
|ATK / DEF||2400 / 2000|
Lore4 Level 4 "Wyrm" monsters
You can also Xyz Summon this card by using a “Number 91: Thunder Spark Dragon” you control as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.) Once per turn: You can select 1 of the following effects and activate it. - Detach 2 Xyz Materials from this card; destroy monsters your opponent controls up to the number of “Wyrm” monsters you control, except this card. - Detach 4 Xyz Materials from this card; gain control of as many DARK Wyrm-Type monsters your opponent controls as possible.