fix

Confirmed, "At the start of the Battle Phase" means the start step of
the battle phase

script/c97120394.lua

@@ -11,7 +11,7 @@ function c97120394.initial_effect(c)
 	c:RegisterEffect(e1)
 end
 function c97120394.condition(e,tp,eg,ep,ev,re,r,rp)
-	return Duel.GetCurrentPhase()==PHASE_BATTLE and not Duel.CheckPhaseActivity()
+	return Duel.CheckTiming(TIMING_BATTLE_START)
 end
 function c97120394.target(e,tp,eg,ep,ev,re,r,rp,chk)
 	if chk==0 then return true end