Each symbol code is surrounded with brackets ']' and can be input in most text areas in Magic Online.
Note that some of these symbols are not operational in the Wide Beta client.
If you enclose a card's name in curly brackets '}', it will create a link in chat. {Might of Oaks}
To specify a specific set, add a colon ':' and the set code to the end of the card's name. {Might of Oaks:UL}
If you'd like to make the card foil, add an asterisk '*' anywhere in the card name. {Might of Oaks*:UL}
Credits
Credit for the original contents of this page goes to 'Tempesteye'. Updates by ORC_Phage
: sh
: si
: sj 
: sk
: sSpellL
: sSpellA 
: sSpellC
: sSpellS 
: sSpellI 
: sSpellE 
: sAdept 
: sPig
: sLizard
: sClan 
: sE
: sHat 
: sWiz 
: sZ
: sLifeHeart 
: sV
: sTap
: sT
: sQ
: sArrSettingsU 
: sArrHelpU 
: sCLONE
: sGY
: sBooster 
: sArrSettingsD 
: sArrHelpD
: sListBoxArrowU
: sArrAdminU 
: sArrCardsU
: sArrCommunityU 
: sArrGameplayU
: sListBoxArrowD
: sArrAdminD
: sArrCardsD
: sArrCommunityD 
: sArrGameplayD 
: sSwoosh 
: sCardHand
: sPB B
: sPB W
: sS
: sF
: sY
: sMute