ひゃく にん いち しゅかるたであれば
hyakunin'i chi shu karutadeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 百人一首かるた

1. If it were a Hyakunin Isshu karuta; If it is a Hyakunin Isshu karuta

Ba Conditional