Preventing one or two creatures from blocking during a turn is likely the least selected effect of Untimely Malfunction
Elspeth, Storm Slayer This 5-drop mono-White planeswalker has 5 loyalty and then doubles your token-making with a Parallel Lives static ability
BLUE Metamorphic Alteration I'm not sure what decks want to run Metamorphic Alteration but I'm glad this weird card exists
In the case of equipping one mana artifact equipment and redeeming mutagen tokens, those would then be free
Midnight Reaper [c]Midnight Reaper[/c] works best when your deck runs lots of creatures, specifically nontoken creatures
Obviously, you dont really want to give up a real creature for the effect all the time, otherwise it is a roundabout way of rummaging, but recurring removal spells is especially potent, and giving up a creature for that is often going to be worth it, especially if you sacrifice a card that brings you some value when it dies