Basically, the Base Set is the first ever set of cards to be released
The London mulligan lets you draw a fresh 7 cards each time, then put cards back equal to the number of mulligans taken
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I'm not sure what else you'd do with it
You can tap any three untapped Zombies you control, including ones you havent controlled continuously since the beginning of your most recent turn, to pay the cost of Cryptbreakers second activated ability
That all said, if youre running into a lot of Gyarados EX decks, its worth swapping in a Hitmonlee for one of the supporter cards, a Marshadow, or a Regirock