What are the Welcome back gifts in each different ranks? How can I get it ?
You have to be inactive from the account with which you plan to get the "gifts" for at least one month. They can vary according to rank, but you'll most likely get a Score Multiplier Pass, some supplies and crystals.
When you open your account after 31 days, you'll get welcome gifts according to your rank. That includes crystals, supplies, passes, etc.
There are no more welcome back gifts I think.
"Welcome back" gifts are no longer issued.
One of Russian administrators stated it in his post here.
Oh that is sad but then why are other people saying that is still is here?
Сервис поддержки клиентов работает на платформе UserEcho