After this card was Normal Summoned, your opponent cannot activate Spell/Trap Cards for the rest of that turn.
Yeah, utility creatures are a little bit boring, but I think theyll all help fill a role, and as the deck is becoming a bit more midrange, these will be welcome two-for-ones or of vital importance that Scavenging Ooze alongside your Nihil Spellbomb and your Bojuka Bog (plus Crop Rotation to find it and Life from the Loam to recur it) should be just enough to make sure an opponent who wants to get away with graveyard shenanigans will meet stiff resistance
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Dont buy an Ad Nauseam just because every black deck plays Ad Nauseam, but do buy an Ad Nauseam if you have identified black as a color you are likely to play at some point
I also want to point out something important: this spell is an instant , as opposed to most red damage based wipes