A Peasant Cube staple, a card that is literally in the Magic Online (MTGO) Vintage Cube, and a card that meaningfully contributes to a range of archetypes for all kinds of Cubes in between, Shriekmaw has long been a favorite of mine
It stops your opponent from playing spells with even CMCs, and if they control any creatures with even CMCs, then they can't block (and your opponent wouldn't be able to play any more of them anyway)
For it's still very strong, but I think the advantage that comes with Notion Thief stealing the cards it denies is better
It's getting to where there's enough of these random effects around, Blim, Comedic Genius and stuff like that that it's pretty doable, they just tend to involve red and then almost every other color in the game, which is kind of frustrating
Big ticket reprints include The Scarab God, Rot Hulk, and Unholy Grotto
Mind Over Matter, meanwhile, can draw and discard cards in a never-ending loop to mill out right away