Honestly, that card is just meh. It's not a quick play, and the monsters' effects are negated. It might allow you to get multiple fire turkeys on the field during your next turn, but...so? You'll prob be OTK'd by then with how this current meta is.
What this deck desperate needs in Fire King Avatar Arvata to shut down all the monster effect 🔥 going on (i.e. Sylvans), and Circle of the Fire Kings for more synergy. Fire King High Avatar Garunix would probably be too broken for Duel Links, but those two other cards alone would make this deck Tier 1 or 2 again.
I do agree with you that those cards you mentioned are very good to this deck, but none of them can search nephthys in your deck and special summon it or add it to your hand you know. My point is a decent replacement for Card of the Soul.
Heya
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