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Storing these for further development, have to take a break from it though.
Scourge of the Skies - Red Baron
Level 8
WIND/Warrior
2800/1400
This card can only be special summoned when your graveyard contains ten or more "Scourge of the Skies" cards and you control four or more Mach Counters. Once per turn you can remove one "Scourge of the Skies" card from your graveyard or field to gain one Mach Counter. The controller of this card can release any number of Mach Counters to activate one of the following effects:
1: Change the battle position of one monster on the field.
2: Destroy one card your opponent controls.
3: Special summon one "Scourge of the Skies" card from your graveyard.
4: Draw one card.
5: Remove from play one card your opponent controls.
6: Look at your opponent's hand, select one card and discard it.
7: Destroy all cards on your opponent's side of the field.

Scourge of the Skies - Bomber
Level 5
WIND/Machine/Tuner
2300/800
When this card is successfully summoned, gain one Mach Counter. Once per turn, you can release one Mach Counter to destroy one facedown card your opponent controls.

Scourge of the Skies - Fighter
Level 4
Wind/Machine
1900/300
This card cannot be normal summoned or set. This card can only be special summoned from the hand or graveyard by releasing one Mach Counter you control. There can only be up to two "Fighter" cards on the field at any time.

Flight Commander
Level 3
Earth/Warrior
1600/0
When this card is successfully summoned, you can release two Mach Counters you control to add one "Scourge of the Skies" trap, spell, or level four or lower monster card from your deck to your hand.

Scourge of the Skies - Sabateur
Level 2
Earth/Warrior/Tuner
0/0
When this card is successfully summoned, the controller of this card can release it to take control of one of your opponent's Mach Counters.

Scourge of the Skies - Fueling Platform
Level 1
Water/Machine
0/0
This card cannot be selected as an attack target if you control a "Scourge of the Skies" monster. Once per turn you can select and activate one of the following effects:
* Select one "Scourge of the Skies" monster you control. That monster cannot declare an attack this turn. The selected monster permanently gains 200 attack.
* Release this card. Gain one Mach Counter for each "Scourge of the Skies" monster you control.

Anti-Aircraft Battery
Level 3
Earth/Machine
1300/500
Once per turn you may choose and activate one of the following effects:
* Remove one Mach Counter your opponent controls.
* Roll a six-sided die. Deal 400 points of damage x the result of the die roll to your opponent's life points.

Scourge of the Skies - Grand Armada
Level 6
Wind/Warrior/Synchro
2200/500
1 "Scourge of the Skies" Tuner + 1 or more Non-Tuner(s)
Once per turn, you can choose and activate one of the following effects:
* Release one "Scourge of the Skies" monster and gain Mach Counters equal to half of the released monster's level (rounded down).
* Remove from play one "Scourge of the Skies" monster from your Graveyard. Special summon one level four or lower monster from your graveyard.
* Select one removed from play "Scourge of the Skies" monster. Return it to the graveyard and gain one Mach Counter.

Scourge of the Skies - Red Leviathan
Level 12
Wind/Dragon/Synchro
1 "Scourge of the Skies" Tuner + 1 or more "Scourge of the Skies" monsters
1000/4000
Release any number of Mach Counters you control. Your opponent takes 1000 damage for each Mach Counter released in this way.

Scourge of the Skies - Wingman
Normal Spell
This card can only be activated when you control three or more Mach Counters. Release one Mach Counter to Special summon one level three or lower "Scourge of the Skies" monster card from your deck to the field.

Scourge of the Skies - Barrel Roll Left
Normal Spell
You can only activate one "Barrel Roll" card per turn. Release two Mach Counters and remove one "Scourge of the Skies" monster from your graveyard to pick up the top two cards of your deck. Select one of them and add it to your hand. Place the other on top of your deck and shuffle your deck.

Nation's Muster
Continuous Spell
This card can only be activated when you control three or more Mach Counters. Once per turn, during your Main Phase, gain one Mach Counter. You can only control one "Nation's" card at a time.

Nation's Draft
Normal Spell
Release any number of Mach Counters you control. Special summon one "Scourge of the Skies" monster from your graveyard with a level equal to the number of released Mach Counters. You can only control one "Nation's" card at a time.

Nation's Rage
Continuous Trap Card
Activate this card only after three or more "Scourge of the Skies" monster cards you controlled were sent to the field during the same turn. While this card remains face up on the field, you can normal summon one additional time per turn. You can only control one "Nation's" card at a time.

Scourge of the Skies - Barrel Roll Right
Normal Trap Card
You can only active one "Barrel Roll" card per turn. Activate only when your opponent declares an attack on a "Scourge of the Skies" monster card you control. Pay 500 lifepoints to destroy the attacking monster and gain Mach Counters equal to half the destroyed monster's level (rounded down).

Scourge of the Skies - Zeppelin Field
Normal Trap Card
Activate when your opponent declares an attack. Release two Mach Counters you control to negate the attack. You can then declare an attack with the targeted monster. If the attack is declared, the attacking monster gains 500 ATTACK points until the end phase of this turn.

Scourge of the Skies - Kamikaze
Normal Trap Card
Activate when your opponent summons a monster. Tribute one "Scourge of the Skies" monster card on your side of the field to destroy the summoned monster. Gain one Mach Counter.

What about a Scourge of the Skies - Kamikaze?

Ah so it is. I must've been tired.

So far so good, I'm really liking your card designs. Can't wait to see the Ground Deck. :U