"With regard to poison counters, Mark Rosewater designed the block structure, and it was very important to him that poison cannot be undone."
Here's the link: http://www.wizards.com/Magic/Magazine/Article.aspx?x=mtg/daily/ld/110
"With regard to poison counters, Mark Rosewater designed the block structure, and it was very important to him that poison cannot be undone."
Here's the link:
http://www.wizards.com/Magic/Magazine/Article.aspx?x=mtg/daily/ld/110