Cards like Possibility Storm, Grip of Chaos, or Warp World dont just make it harder for opponents to think ahead: They make it essentially impossible since they completely randomize several aspects of the game
Maralen of the Mornsong and Colfenors Plans are two just such cards that I happened upon way back in early 2008, the sets at the time in Standard were: Tenth Edition, Coldsnap, Time Spiral, Planar Chaos, Futuresight, Lorwyn, and Morningtide very cool sets that collectively had a metric butt-load of awesome cards, like Tarmogoyf, Mutavault, and Vendilion Clique
The Pokmon Flute Item card puts a Basic Pokmon from your opponents discard pile onto their Bench, immediately boosting the potential for Crystal Waltzs damage
However, suppose you do lose the monarch
Those who check TCGPlayer will notice that this card is valued on the market at $150.00
"Cards Against Humanity buys piece of the U.S