Normally I play with a little system I came up with called "Arrows". Basically, whenever you do something bad to me (attack me, blow up one of my permanents, etc.), you get an Arrow. An Arrow is a token-like card (with an Arrow on it) that I put on the table pointing at you. This means I owe you a beating.
Arrows are not permanents and do not directly affect (or are affected by) the game. They are simply my way of indicating who I'm mad at. When it's my turn, the current Arrow determines who I give my retribution to for the turn. In the case of multiple Arrows, they are first-in, last-out (like the stack). So the most recent person to hurt me gets hurt back.
If no one has an Arrow, I usually just attack the person with the highest life or the best board state.
Ways to get an Arrow:
  • If you attack me, it's an Arrow. Doesn't matter if the attack succeeds or how much damage it is. If someone else Fogs, you still get the Arrow, because you did try to hurt me. If you are attacking me with a creature that cannot possibly do damage (Solemn Simulacrum into a huge blocker, etc.), I usually don't give the Arrow.
  • Each non-token permanent that is destroyed, exiled, or stolen is an Arrow. Yes, wrathing my board generates a lot of hate from me.
  • Direct damage (burn): Each 5 direct damage to me within a turn is 1 Arrow. If you do 4 or less, it's nothing.
  • Bouncing permanents: Divide the number of permanents you bounced by 2, rounded up. This is how many Arrows you get. Note that bouncing one permanent is an Arrow.
  • Countering one of my spells is an Arrow. This means I may attack you immediately, as it's probably my turn.
  • Discard is not an Arrow unless you make me discard my whole hand, at which point it's 1 Arrow. Wheel of Fortune (discarding and refilling my hand) is not an Arrow.
  • Mill is not an Arrow unless you mill my entire library, which is an Arrow (probably not relevant because I'm likely dead!)
  • Preventing me from doing things (Stasis, Iona, etc.) is an Arrow for each turn I can't act or do what I want. This includes protecting the player who has the current Arrow. Mindslaver is an Arrow, but if you wreck my stuff while you control my turn, you will get more.
  • Playing a New Phyrexia Praetor (Elesh Norn, etc.) is an Arrow. You may very well get more if the Praetor destroys non-token permanents of mine. I don't usually give an Arrow for Urabrask (the red one); he's not too bad.
  • Removing Arrows:
  • When I attack you, I remove an Arrow. While I'm attacking you, if you destroy one or more of my creatures (or other permanents), I don't give additional Arrows, because you are simply "protecting yourself". You are in a sense immune to Arrows while I'm attacking you.
  • I remove an Arrow for each non-token permanent I destroy. Basically, if I do anything that would cause an Arrow (above), I clear the same number of Arrows on you.
  • If I cannot affect the player with the current Arrow at all, I usually just pass (and wait for next time). I don't usually attack the next player in the stack. I automatically clear one Arrow at the end of my turn if I did nothing.
  • You cannot bribe me or do favors for me to remove Arrows. I hate you for what you did. You need to die.
  • If someone dies, (obviously) all the Arrows pointing at him are removed from the Arrow pile.
  • Other notes:
    Arrows do lots of cool things:
  • People don't complain that I'm "targetting them". If you have an Arrow, you deserve your beating.
  • Arrows seem to work as a deterrent to people trying to hurt me or my board state; sometimes people fear the Arrow, and will not attack me, because they know they will be hurt back.
  • Sometimes (especially when it's 3 AM!) I'm too tired to properly play Arrows. Complaining about me not following the Arrow rules properly is likely to get my ire!