MTG Salvation

5/1/2008 An “unblocked creature” is a creature that attacked and wasn’t blocked. Creatures aren’t “blocked” or “unblocked” until the declare blockers step, so activating this ability before then (or after combat ends) will have no effect.

5/1/2008 Creatures stop being unblocked as the combat phase ends. However, they’ll stay 4/1 until turn ends.

5/1/2008 Inkfathom Witch doesn’t cause creatures to lose their abilities.

5/1/2008 If Inkfathom Witch is attacking and unblocked, it can make itself 4/1.

10/1/2009 The effect from the ability overwrites other effects that set power and/or toughness if and only if those effects existed before the ability resolved. It will not overwrite effects that modify power or toughness (whether from a static ability, counters, or a resolved spell or ability), nor will it overwrite effects that set power and toughness which come into existence after the ability resolves. Effects that switch the creature’s power and toughness are always applied after any other power or toughness changing effects, including this one, regardless of the order in which they are created.