(I thought of this before his original buffs were announced)

s1: Attacks the enemy. If the caster is buffed, has a 30% chance per buff to perform up to 1 additional Dragon Flame attack. s2: When attacked, has a 40% chance to counterattack and 100% chance to counterattack with Dragon Flame after suffering a critical hit. s3: Attacks all enemies before increasing the Attack and Defense of the caster for 2 turns. Dragon Flame: Always inflicts a critical hit and deals damage proportional to the caster's lost health. Recovers the health of the caster proportional to 30% of the damage dealt. If the caster kills the target with this skill, extends all buff durations by 1 turn.

Reasoning: With these changes, he will become much more flexible in terms of builds while also injecting some new mechanics into his kit. Built in healing allows for eff res builds to forgo sigurds for strak guantlet, while the typical immunity build can use proof of valor to prevent one-shots. The extra buffs + buff extension will further amplify his solo potential while still providing counterplay (units like basar and kluri will still dominate him even with an eff res build) and the chance to use dragon flame after s1 will introduce some RNG into his kit making him more viable on defense teams similar to Charles.