If your opponent Special Summons a monster(s) while you control no cards: You can discard this card, then target 1 face-up monster your opponent controls; this turn, that monster cannot be Tributed, or used as material for a Fusion, Synchro, Xyz, or Link Summon. You can only use this effect of "Gnomaterial" once per turn.
![Gnomaterial [MZMU-EN089] Rare | Gear Gaming Bentonville](http://bentonville.geargamingstore.com/cdn/shop/files/ygo_placeholder_106e69af-dd5a-4759-9e3f-ad92186bbbae.png?v=1771446021)
