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Here you go, straight from the FAQ stickied at the top of the forum:

Q: How do I post Magic symbols, such as the mana symbols?
A: The mana cost tags can allow you to do that. Simply place the appropriate letter or number for the symbol you want to display between [mc] tags. Use parentheses to enclose multi-letter symbol codes. The translation is as follows:
Symbol codes Show

Basic colors: w u b r g =

Colorless symbols: x y z 0 1 2 3 4 5 6 7 8 9 (10) (11) (12) (13) (14) (15) (16) =

Hybrid symbols: (wu) (ub) (br) (rg) (gw) (wb) (ur) (bg) (rw) (gu) =

Other symbols: s t q c p (pw) (pu) (pb) (pr) (pg) (2w) (2u) (2b) (2r) (2g) =

You can also use smilie codes. Click the image in the post editing box to get a popup box showing all the smilies, and click on the one you want--it'll insert the appropriate code into your post. (And once you know the code for what you want, you can just type it to get the same results without needing the popup.)