Merlin is limited servant which means you can only gocha him in specific summoning poll, like this winter and another one is almost next September. Otherwise you may have him in 3 lucky bag summon but the chance is also RNG approximately to 0.
Beside of that, his is limited, no way to summon him. Rin is the same. In specific summoning pool, they are waiting for you to burn the money no matter what your story progress it is. If you missed the time for their summon pool, they will never shown up
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