I love the unglued set... but if I have to pick just one card, I'd go with Burning Cinder Fury of Crimson Chaos Fire.
The sheer randomness it created was always hilarious.
Whenever any player taps a card, that player gives control of that
card to an opponent at end of turn.
If a player does not tap any nonland cards during his or her turn,
Burning Cinder Fury of Crimson Chaos Fire deals 3 damage to that
player at end of turn.
card to an opponent at end of turn.
If a player does not tap any nonland cards during his or her turn,
Burning Cinder Fury of Crimson Chaos Fire deals 3 damage to that
player at end of turn.