what is a player DNA signature?

[Else]

What does it mean?

[Chewett]

The player DNA signature is an experimental way of encoding your various choices of a series of quirky opinion based questions into a DNA string.

Contrary to popular belief it is not tied to story mode and is still in the game, new accounts should, after a few days, be presented with these questions.

It currently has no use in MagicDuel.

[Lazarus]

The DNA signature was something experimental that was implemented to give account identity to a player. It could be gained through the now-defunct original story mode by choosing answers you feel to questions the first few days of creating an account upon logging in.