Card of the Soul can search any monster in your deck, but the down side is that the monster has to have a combined attack and defense points equal to your current life points making this card somewhat difficult to use. The best use for Card of the Soul in this deck would be to search for Sacred Phoenix of Nephthys while your life points are still at a full 4000.
Sphere Kuriboh can be activated from the hand therefore it would be a better choice for this deck than to add protection spell and traps which would most likely be destroyed by your Sacred Phoenix of Nephthys.
Super Rush Headlong protects your monster from attacks by monsters of an attribute you declare. Helpful since most archtypes revolve around a single attribute, forcing your opponent to end the battle phase.
Other useful cards
For cards that can be used in any deck, check the link below.
When Sacred Phoenix of Nephthys is destroyed by a card effect he revives himself during your next standby phase and clears the field of all spell/trap cards. By using cards that take advantage of his effect we are able to continuously clear the enemy's backrow.
Toons gets annihilated by phoenix. Red eyes is ok but doens't really counter it. And naturia is nowhere near being a top tier deck.
That Noob Dude 8days ago
How do people ever win with this. Litterally takes 3 turns to get going and you still have no answer to red eyes, which litterally everybody plays at plat or higher. Ice barrier also crushes this deck. Really feel you need to many cards to get the Phoenix on the field and it takes to long. Naturia also seems to destroy this. I really tried and I understand how it is supposed to work but especially red eyes just crushes this deck as they just trigger their traps when Phoenix spawns and then beatdown kill the Phoenix.
Revives any 1(One) monster on the field destroyed by an effect that turn. Its not used often, as there aren't *that many controlled Destruction cards to make full use.
Still a very good card, think Time Machine for effects instead of battle.