Magic: the Gathering - Day of Judgment - Magic 2012

This card does one job and it does it well; and at a reasonable mana cost too. The trick to this card is how you use it. If things aren't going your way then it may be time to drop a Day of Judgement. Maybe you just attacked full out and now you don't want your opponent to use their creatures they didn't use as blockers.

That's fine and all, but here's how I use it: Use this in a knight deck with at least 2 Knight Exemplars on the Field (Other Knights get +1/+1 and Indestructible) so ALL your creatures and Indestructible (can't be destroyed) and you can play Day of Judgement to destroy all of your opponent's creatures without causing any harm to your own.