Blue:
4 Counterspell
2 Arcane Denial
White:
4 Armageddon
4 Wrath of God
4 Gerrard's Wisdom
2 Kismet
Artifact:
4 Icy Manipulator
4 Winter Orb
3 Sky Diamond
3 Marble Diamond
2 Millstone
Land:
4 Tundra
4 Adarkar Wastes
4 Mishra's Factory
7 Plain
5 Island
Imprison you opponent and win with the Millstone (classic key winner).
If your opponent play Gaea's Blessing, you have a BIG problem, but you can win with the Mishra's Factory :-)
When you have the LOCK into play, the game is over, then, Mill, Mill, Mill,....