Valkyries

[Azuh]

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[b]The Valkyrie, Erste[/b]
[LIGHT / Fairy / Effect / Level 6]
If your opponent controls a monster and you control no monsters, you can Special Summon this card (from your hand). If you control another face-up "The Valkyrie" monster, once per turn, you can banish 1 monster from your opponent's Graveyard and this card gains ATK equal to the banished monster's original ATK until the End Phase.
[ATK: 1600 / DEF: 1800]

[b]The Valkyrie, Zwei[/b]
[LIGHT / Fairy / Effect / Level 5]
If you control a face-up "The Valkyrie" monster other than "The Valkyrie, Zwei", you can Special Summon this card from your hand. When this card is Summoned, target 1 monster your opponent controls, and banish it.
[ATK: 1600 / DEF: 1600]

[b]The Valkyrie, Dritte[/b]
[LIGHT / Fairy / Effect / Level 4]
When this card is Normal Summoned, you can Special Summon 1 "The Valkyrie" monster from your hand. This card gains 200 ATK for each banished monster.
[ATK: 1000 / DEF: 1600]

[b]The Valkyrie, Brunnhilde[/b]
[LIGHT / Fairy / Effect / Level 7]
While you control 2 or more "The Valkyrie" monsters, you can Special Summon this card from your hand or Graveyard. This card gains 300 ATK for each banished monster. This card cannot be destroyed by battle. When a Spell or Trap Card is activated, you can negate that activation and this card loses 1000 DEF. You must have at least 1000 DEF to activate and to resolve this effect. You can only control 1 "The Valkyrie, Brunnhilde"
[ATK: 1800 / DEF: 2000]

[b]The Valkyries Fortune Chariot[/b]
[WIND / Fairy / Union / Level 3]
Once per turn, during your Main Phase, you can equip this card to a "The Valkyrie" monster you control, as an Equip Card, OR unequip it to Special Summon this card in face-up Attack Position. If equipped to a monster by this card's effect, each time that monster inflicts Battle Damage to the opponent, banish 1 card your opponent controls. (A monster can only be equipped with 1 Union Monster at a time. If the equipped monster would be destroyed, destroy this card instead.)
[ATK: 0 / DEF: 0]

[b]Ride of the Valkyries[/b]
[Normal Spell]
Special Summon from your Graveyard as many "The Valkyrie" monsters as possible. During the End Phase, banish all monsters that were Special Summoned by this effect.

[b]Swan Maiden[/b]
[Normal Spell]
Add 1 "The Valkyrie" monster from your Deck to your hand.

[b]Pegasus Wings[/b]
[Normal Spell]
This turn, if you banished a monster, all "The Valkyries" monsters you control are unaffected by the effects of Trap Cards.

[b]Rainbow Bridge Bifrost[/b]
[Quick-Play Spell]
Face-up "The Valkyrie" monsters you control gain 300 ATK for each banished monster. This increase lasts until the End Phase. During the End Phase of this turn, destroy all face-up "The Valkyrie" monsters you control.

[b]Enchanted Sword Nothung[/b]
[Equip Spell]
When you equip this card, banish all face-up Dragon-Type monsters your opponent controls and in their Graveyard. The equipped monster gains 400 ATK. If the equipped monster is a "The Valkyrie" monster and it battles a Dragon-Type monster, banish that monster at the start of the Damage Step, without applying damage calculation.

[b]Valkyrie's Embrace[/b]
[Normal Trap]
Target 1 face-up "The Valkyrie" monster you control and 1 monster your opponent controls. Change the battle position of your targeted monster, and banish your opponent's targeted monster.

[Toffee.]

Zwei seems a little overpowered, TBH, mostly because it Banishes any 1 monster, regardless of how it is Summoned.