Thundermaw Hellkite

Flying
Haste (This creature can attack and {T} as soon as it comes under your control.)
When Thundermaw Hellkite enters, it deals 1 damage to each creature with flying your opponents control. Tap those creatures.

Starter Commander Decks

Iconic Masters

Flying, haste
When Thundermaw Hellkite enters the battlefield, it deals 1 damage to each creature with flying your opponents control. Tap those creatures.

Magic 2013

Flying
Haste (This creature can attack and {T} as soon as it comes under your control.)
When Thundermaw Hellkite enters the battlefield, it deals 1 damage to each creature with flying your opponents control. Tap those creatures.

If the damage that would be dealt to a creature with flying is prevented, that creature will still be tapped. If that damage is redirected to another creature, the creature with flying will be tapped, not necessarily the creature that ultimately was dealt damage.

Thundermaw Hellkite will deal 1 damage to each creature with flying your opponents control whether those creatures are tapped or untapped.