Cloud Cover

Whenever a creature becomes the target of a spell or ability, return that creature to its owner's hand. (It won't be affected by the spell or ability.)

Each opponent can't draw more than one card each turn.

Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card.

Whenever another creature you control becomes the target of a spell or ability, you may airbend that creature. (Exile it. While it's exiled, its owner may cast it for rather than its mana cost.)

Whenever a spell or ability an opponent controls destroys a noncreature permanent you control, you may destroy target permanent that opponent controls.

All Slivers have "Whenever this permanent becomes the target of a spell an opponent controls, you may draw a card."

Flying

Whenever a Dragon you control becomes the target of a spell or ability an opponent controls, destroy target nonland permanent that player controls.