Guardian Seraph

Creature — Angel

Flying
If a source an opponent controls would deal damage to you, prevent 1 of that damage.

3/4

2009-10-01:
This ability prevents 1 damage from each source an opponent controls each time that source would deal damage to you. It prevents 1 of any damage, not just combat damage.
2009-10-01:
Spells and permanents have controllers, but cards that aren’t on the stack or the battlefield don’t. If a source without a controller (such as a cycled Jund Sojourners, for example) would deal damage to you, 1 of that damage is prevented if an opponent owns that source.
2009-10-01:
The effects from multiple Guardian Seraphs are cumulative.