I got this after work. While I know nothing about Magic: The Gathering, I've considered looking into it before, and Final Fantasy 6 is my favourite of the series. If I'm only getting one set of those cards, it might as well be that one.

Pleasantly surprised to see that they had the entire party, including the optional members Gogo and Umaro.

(FF6 had a fairly big party with fourteen members - Strago and Relm were combined into one card)

hurrah~

which Gogo card is in there?

Mysterious Mime or Master of Mimicry?

(red or blue?)

Red, if I recall correctly. (I wasn't aware that characters had multiple cards)

some do

the blue version of Gogo is in boosters and is highly sought after it seems

I just checked; I'm not sure what the colours mean, and I'm assuming all these decks are the same, but it included:
-Terra, Herald of Hope (yellow, holographic)
-Celes, Rune Knight (yellow, holographic)
-Locke, Treasure Hunter (black and red)
-Edgar, Master Machinist (red and yellow)
-Sabin, Master Monk (red)
-Cyan, Vengeful Samurai (yellow)

-Shadow, Mysterious Assassin (black)
-Gau, Feral Youth (red)
-Setzer, Wandering Gambler (black and red)
-Mog, Moogle Warrior (red and yellow)
-Strago and Relm (red)
-Gogo, Mysterious Mime (red)
-Umaro, Raging Yeti (red)
-Kefka, Dancing Mad (red)