Draven, Audacious

If draven is killed in combat but is saved by a guardian angel (or similar effect that replaces the death), do my opponent score a point?

No, draven never went to the trash, it did not dies.

Q: If I win on the attack and conquer, does this happen before or after I score? Before or after conquer effects?

Draven’s ability will trigger and resolve before you gain your regular point for scoring the battlefield and before any conquer effects are triggered. This means that you can’t win from 6 points by conquering a battlefield with Draven without having scored all other battlefields—you’ll gain your point from Draven, then the game will see that you’re at 7 points and give you a card draw instead of a point for conquering.

Q: What does it mean to win or lose a combat?

Winning and losing combats is a system that was inadvertently left out of the most recent rules update. Here are the conditions under which you win, lose, or tie a combat.

After combat damage has been dealt:

• If neither player has units remaining at the battlefield or both players have units remaining, combat is a tie. If both players do, attackers are recalled.
• If only one player has units remaining at the battlefield, that player wins the combat and the other player loses. Draven triggers if he’s among the units that survive.

It doesn’t matter whether combat damage was actually dealt, only that there was a combat showdown and only your units were left after combat damage. If you killed or removed all the opposing units with spells and abilities before Draven had to throw any punches, he still wins. (Think of it as winning by default.)

You can win a combat on either offense or defense.