嘆きの天使

瞬速
先制攻撃、警戒
対戦相手１人がクリーチャー・呪文１つを唱えるたび、ターン終了時まで、嘆きの天使はクリーチャーでない。
嘆きの天使がクリーチャー１体に戦闘ダメージを与えるなら、そのダメージを軽減し、そのクリーチャーのオーナーはそれを自分のライブラリーに加えて切り直す。

Weeping Angel

Flash
First strike, vigilance
Whenever an opponent casts a creature spell, this creature isn't a creature until end of turn.
If this creature would deal combat damage to a creature, prevent that damage and that creature's owner shuffles it into their library.

Doctor Who

As the first triggered ability of Weeping Angel resolves, it continues to be an artifact but will stop being both an Alien and an Angel until it becomes a creature again. It's just a statue, how dangerous could it be?

Damage that is prevented never occurs, so any triggered abilities that trigger due to combat damage that would have been dealt by Weeping Angel won't trigger.

If an opponent casts a creature spell with flash while Weeping Angel is attacking or blocking, it is removed from combat because it stops being a creature. However, any creatures that it was blocking are still considered blocked.