So lets get to it for the sake of it.
1)
A mage with 0 armor gets rusted (revealed). Afterwards the mage casts a dragonscale hauberk.
Will he now have 2 armor or 0 armor?
(my guess is he will have 2 armor. Like a necro vamp can fly if maim wings is already revealed before necro pays 1 mana to fly (or am i wrong here as well?))
2)
If i have the marked for death (revealed), Rust (revealed) and a facedown enchantment transfusion.
The creature suffers an attack that will just excately kill it considered the rust effect takes place - will i have the option to reveal enchantment transfusion after damage is applied to transfer marked and rust to another target, or will this make the target survive the attack?