To triple a creature's power, that creature gets +X/+Y, where X is twice that creature's power and Y is twice that creature's toughness when Tifa's Limit Break resolves
It takes too much setup for my liking, but with the right amount of support it could do some work
Lots of interaction helps keep opponents off your case while you focus on questing and racking up that game-winning lore
Im most inclined to suggest a Voltron playstyle for Kefka, since both halves benefit from combat buffs, but honestly, you can build any deck around him
There are also unique sets like the Challenge set for competitive events, and the D23 Collection set that were only available in one special collectors box set
The two foil cards in each deck have unique rainbow foiling that is different from those in the main set