For that special someone you really, really hate.

You've had opponents you hate. That guy who thinks he's a Magic virtuoso just because he can pilot a burn deck. The kid who just started playing and thinks he knows it all, but still tries to attack your creatures every single game. The girl who wants to play "fast mana." The old timer who plays Stasis.

But has there even been one guy... that guy... who was worse than all the others? That you really wanted to get back at? That you wanted to... physically destroy a bunch of his expensive cards? In-game... and legally, too?

That got your attention.

1. Play Mycosynth Lattice. Everything in play is now an artifact.
2. Play March of the Machines. Everything in play is now an artifact creature. (You should probably play something like Glorious Anthem to make sure your lands stick around.)
3. Play Blacker Lotus. It will now be a creature, thanks to March of the Machines.
4. Play Mindslaver to take over your opponent's next turn.
5. During his turn, play Mirrorweave, targeting your now-animate Blacker Lotus.
6. Proceed to activate the Lotus' ability for all of your opponent's permanents.
7. Oh, yes.

Be forewarned - if your opponent catches on to your master plan, he'll either concede or start bashin' heads. Still, this is among the most evil things I think you can 'legally' do in a Magic game.

I Think, Therefore I Am

Maybe tinkering with Un-cards is kind of cheating, since there are no end of rules they break for the fun of it. That said, I think we have a very unusual scenario that you wouldn't expect to be able to achieve, with Yet Another Aether Vortex. With a tricky little scenario, it can be in play simply because it says so.

Even if there are no permanents in play, and no cards in any player's hand or graveyard, Yet Another Aether Vortex can be face-up on top of your library, as well as in play. This may not seem possible in a vacuum, but consider this: you have a copy of Yet Another Aether Vortex in play, which naturally reveals the top card of your library, being... a second copy of Yet Another Aether Vortex! So the one in play makes the one on top of your library count as being in play as well, making its abilities active just as any other permanent's would be. But let's say you then play Renounce, sacrificing everything you've got except for the Vortex on top of your library. Now it is your only permanent, and it's only still in play because it says it is. "The top card of your library is in play." "Sez who?" "Me, the top card of your library!" Its ability keeps its ability active. Sure, when you draw it next turn the party is over, but whoever saw that one coming?