IF/TOTW/TOTY cards all are black with their corresponding colour rating (bronze, silver gold) in writing/outline.
UP - Uprated/Upgraded, a normal-styled card, usually made to reflect a player's performance over a set period of time. Usually appear in the second half of the season iirc.
IF - In-form players, usually who perform well during the week, or who the mods like or whatever.
SIF - Second In-form, when they perform well again during any other week which sees an improvement on the original IF boost.
TIF - Third In-form, again, following on from the above.
TOTW- Team of the week is the set of cards which is out every week which contains IF cards, etc
TOTY - Team of the Year, near the end of the actual year, and then again near the end of the football season, the 'best' players get massively improved variants of their cards.
There are some other colours, last year they had Orange, Purple (I think?) and Blue near the end which I'm not sure of.