Some cards use special symbols in their text that are not included in the program. The ones I noticed are:
- The energy symbol for Kaladesh block cards (http://gatherer.wizards.com/Handlers/Image.ashx?size=small&name=e&type=symbol)
- The chaos symbol for Planes (http://gatherer.wizards.com/Handlers/Image.ashx?size=small&name=chaos&type=symbol)
- An infinite mana symbol and a "100" mana symbol both appearing only on Mox Lotus (http://gatherer.wizards.com/Handlers/Image.ashx?size=small&name=Infinity&type=symbol) (http://gatherer.wizards.com/Handlers/Image.ashx?size=small&name=100&type=symbol)
- A weird generic Phyrexian mana symbol that only appears on the text of Rage Extractor (http://gatherer.wizards.com/Handlers/Image.ashx?size=small&name=p&type=symbol)
- There's also the half colorless mana symbol for some Unhinged cards but that one doesn't even appear on Gatherer.
While far from essential, I think it would be cool if the Assistant supported them. Thanks a lot!