Anyone know when the next waver banner is coming and when Merlin is coming?

Though its true that will be the average its worth noting there is still a 36% chance of not getting a 5* after 100 rolls which is obviously a much higher number than intuition tells us. And obviously thats only a 5* for getting a specific 5* on rate up 100 rolls has a 49.5% chance of not giving you the servant you want.175 rolls will give you ~70% odds of getting what you want and if you want a 90% chance of getting your target you need a massive 325 rolls.

Or you can just have EX luck either way~

On the point of Merlin being on the support list, the same can be said about Waver. While it's arguable that when Merlin drops he will appear in the friend list more than Waver, I don't think Waver will be phased out completely.

That being the case, whether OP should roll for Merlin or Waver depends entirely on personal preference, and I would argue it's better for OP to roll Merlin since he's the only one on rate-up for his banner so there's a much lower risk that OP will be spooked by another 5*. Also Merlin's banner being later in the year gives OP more time to save quartz.

its not a %1 and its not a guaranteed percentage either. you can roll a thousand times and still not get and ssr which a lot of whales tend to do
there is even a official warning every gacha game makes