I've always been a big fan of cards like Torpor Orb and Hushbringer, but it can be difficult to play these cards in decks including white because they can cause you to miss out on powerful creatures such as Recruiter of the Guard and Stoneforge Mystic
It could be a board wipe, a removal spell, card draw, ramp, or even a counterspell
So now we are seeing lists playing more planeswalkers and upping the discard count as well
In most games, players have access to their Commander on board, making this spell free
The main disadvantage that Oswald Fiddlebender has is that he needs to stick around so he can tap to activate his ability, but you can rapidly chain things together to set up a combo or try to lock things down
This effect cant reduce the mana in that cost to less than one mana