forgot that class

[Shinoskay]

There was a dragon based prestige class that gives you a spell from any class list, anyone know what it was called.

[AssociateGreen]

Wyrm Wizard from Dragon Magic.

[pabelfly]

Wyrm Wizard.

You might also find this thread handy for similar classes: https://forums.giantitp.com/showthread.php?646021 (Ways to Expand A Spell List)