Aliasing mtg -> magic_the_gathering.

Reason: acronym of the latter.

In regard to this tag: Should all card names be rolled under this tag, or just leave them be?

I dunno about all card names, but popular ones, like ink-eyes, sure.
Gonna add this alias and that implication.

we really don't need to know the individual card names. :) If one repeatedly and consistantly pops up, sure, maybe, but, generally? naw.