Isgald Vorst is one of the new gladiator cards.
All the gladiators have bloodlust, which increases all stats+1 per kill.
You can see the battle here:
https://qa.splinterlands.io/?p=battle&id=sm_fz3h26LUt7i38VpnTiZt
(this link is for the test server, so it might not work forever)