Combos Utilizing Windfall

simple and efficient, you get cards, they take damage

Discard Discard Discard

Play Megrim, then Hibernation, then Windfall. They'll feel the pain for all that discarding.

play dreams discarding enough cards to bounch all opponent's nonland permanents to his/her hand. cast windfall to refill your hand with cards

Cast Megrim, then Ill-Gotten Gains,discard Windfall and the rest of your hand. Return Windfall to your hand when Ill-Gotten Gains resolves and cast. Kills in one turn if opponent has seven card hand.

Every player has to draw X cards for Prosperity, use windfall to let everybody discards his/her hands and then sacrafice feldon's cane, make sure you've got enough mana

Make them discard all their creatures with windfall. Sunder works well too.

Use hibernation to send all those lovely green perminents to their owners hand. Then use windfall to make them discard!!!

first upheaval..then windfall. piss them all off and save your own hide.

Opponent must discard a good hand(check with glasses) and you retain a good hand possibly filled with permission spells