Oberon BB-FGO-001bBT Build Divide Sign Card

Oberon's signature is that of Japanese voice actor Toyonaga Toshiyuki.
Oberon and Toyonaga look similar. Perhaps this is Oberon's reincarnation.

https://japanfewccfcardgameshop.com/products/oberon-bb-fgo-001bbt-build-divide-sign-card-fgo-fate-grand-order?_pos=10&_sid=510c277f0&_ss=r