How will it affect my Ranked Standing?

You will be seeded into a Ranked League after you play 1 Ranked game on your new server. The seeding will be based on your current MMR in relation to the MMR of everyone on that server, so you could end up in a different Tier or Division compared to the League you were in on your original server.

If you ever decide to transfer back, please keep in mind that you will return to the rank you were at when you left the server, minus any LP decay that would have taken place if a significant amount of time has passed. Your standing is tracked independently on each server, so LP decay will only affect the Ranked standing of the account on the server you have NOT been playing on.

For more information on MMR decay, please see the relevant section of this article.