Cheapest priced copy (New Capenna Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Inkfathom Witch 
Creature — Merfolk Wizard · 1/1 · Uncommon · Shadowmoor · #168
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
{2}{U}{B}: Each unblocked creature has base power and toughness 4/1 until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $0.35 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| New Capenna Commander | 342 | Uncommon | $0.35 | — |
| Planechase 2012 | 97 | Uncommon | $0.35 | — |
| Planechase Anthology | 97 | Uncommon | $0.35 | — |
| Shadowmoor | 168 | Uncommon | $0.35 | $5.99 |
5 rulings from Wizards of the Coast
- 1 May 2008Inkfathom Witch doesn't cause creatures to lose their abilities.
- 1 May 2008An “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.
- 1 May 2008Creatures stop being unblocked as the combat phase ends. However, they'll stay 4/1 until turn ends.
- 1 May 2008If Inkfathom Witch is attacking and unblocked, it can make itself 4/1.
- 1 October 2009The 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.