It's always some A-hole with Displacer (Modern)

I had a deck (https://deckstats.net/decks/42006/444997-you-re-picking-up-what-you-re-/en this deck) which could, at instant speed, make your opponent discard a card. This is nice because it meant that as long as your opponent had a permanent on the battlefield, you could make him discard at the end of his draw step, thus always discarding the card he drew at the beginning of his turn. It was essentially a card lock. It was pretty OP, and somewhat reliable. It's super cool because, really, there is no reliable, repeatable, instant-speed discard (there are instant spells, but nothing like an every-turn discard).

I made another deck with Isochron Scepter + Funeral Charm, and it worked pretty well. But the combo wasn't reliable enough. The deck ran a bunch of rat cards that have ETB discard effects, so I thought about maybe blinking them. I was working with Deadeye Navigator, until I remembered (which I always forget) Eldrazi Displacer. That card, man. That card has enabled a ton of ridiculous blink decks.

Essentially, you use cards to get your opponent to 0 cards in hand. 0 or one. Then, on his draw phase, you blink either Rotting rats, ravenous rats, or chittering rats. That makes your opponent discard the card he just drew. If you manage to blink Chittering Rats it's a pretty hard lock because your opponent will never draw into anything other than the card that he put onto his library.

Stupid control/lock combos are <3.