Condition plays a big role in the value of this card, with damaged copies sinking to $13, followed by heavily played (HP) copies at about ten dollars, then moderately played (MP) at around $14, lightly played (LP) hovering around $30, and no recent near mint (NM) sales
Sealed product: available and competitively priced
Like most errors of this variety, all you can really do is laugh about it, and thats exactly what the official Oracle text regarding the error does: Supertapping Greenwidow: The extended art version of Llanowar Greenwidow erroneously says tapped twice
The leaves the battlefield trigger is a nice perk, but far from your best payoff for pulling off ninjutsu
The problem I faced is that many of these cards aren't particularly good in Commander, as it's focused a bit more on the expensive spells rather than the cheap efficient spells that I love
If a cards health falls below zero it must be discarded, with damage carrying over between rounds