Finneas was a racist half-elf and one of the contestants in the gwent tournament at the Passiflora. Geralt played him if he first beat Bernard Tulle and Sasha. If Geralt defeated Finneas, the half-elf accused the witcher of cheating and fisticuffs broke out.
Finneas unknowingly had something to thank Geralt for, as he was the largest debtor to Whoreson Junior's casino, which the witcher effectively shut down on his quest to find Ciri, and by extension relieved the half-elf of the debt.[1]
He used the Scoia'tael deck.