Grumpiness

Menace, cumulative upkeep {b}
When Grumpiness enters the battlefield, target opponent reveals their hand, then exiles it.
Erm, Irritability didn't do anything wrong, but our
manager Doug made a split second decision to ban it,
so . . . yeah. Poor old Rakdos Scam though, we didn't
want to leave it with just Grief and Fury, so we came
up with Grumpiness! Foolproof.