What are you going to do if you have no Pendulum on your starting hand?
That's happens actually really rarely. In v.1.21 the mulligan thingy was introduced, so you'll now automatically get 2nd set of 7 cards if you didn't have any 0-cost card in your first 7 cards.
Having 6 Pendulums in 30 card deck gives you ~17% change for getting mulligan, and after that you'll have another 17% change for not having any Pendulums in starting hand. Those combined, you'll have a total of ~3% change of starting the game with no Pendulum in hand.
That being said, I wonder whether the use of
Pendulums is really doing any good. Starting a game with only
and
quanta wont help you much.