Mana Leak

Counter target spell unless its controller pays {3}.

Ponder

Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.

Ancient Crab

Vapor Snag

Return target creature to its owner's hand. Its controller loses 1 life.

Evanescent Intellect

Enchant creature
Enchanted creature has "{1}{U}, {T}: Target player mills three cards."

Turn Aside

Counter target spell that targets a permanent you control.

Counterspell

Iceberg Cancrix

Whenever another snow permanent you control enters, you may have target player mill two cards.

Snow-Covered Island

Winter's Rest

Enchant creature
When Winter's Rest enters, tap enchanted creature.
As long as you control another snow permanent, enchanted creature doesn't untap during its controller's untap step.