Forum:Black Ptera Otk deck

Monsters: 21 Black Ptera x2 Cannon Soldier x3 Catapult Turtle x2 Mystic Tomato x2 Flying Kamikiri #1 x2 Spear Cretin Mother Grizzly x2 Gilasaurus x2 Turbo Booster Des Koala Malevolent Mech - Goku En (quick summon for cannon soldier/catapult turtle) Senju of the thousand Hands Relinquished

Spells:12 The Shallow Grave Black Pendant Black Illusion Ritual x2 Monster Reborn Ectoplasmer Dark Room of Nightmare Meteor of Destruction Soul Exchange Card Destruction Level Limit Area-B Different Dimension Capsule Traps: 7 Ultimate Offering x2 Waboku Trap Hole x2 Gravity Bind Needle Ceiling

I'm going to take out the rituals and replace it for 2 more spear cretin for a spear cretin otk.

I'm also going to add another black ptera.

Should i add 2 more soul exchange?

What cards do i need of add/take out?