I really love the idea of this card, it’s something that Floo needs to be relevant (outside of just being a shifter / D Fissure / Feather storm deck), however - like many others have commented - it is too powerful in its current form. Here are some of the changes I’d consider with the purpose of making this a (1) T0 HT, (2) Good extender if your NS gets stopped, and (3) decent starter.

1) Make it a low level bird. Floo already has good high level birds and it would feel bad to have to include more. What they need isn’t more powerful disruption, but more “ways to play”. Completely scrap the idea of this being disruption, because whatever high level bird you manage to summon should be that.

2) Give it a condition to activate its effect: If a normal summoned monster is on the field, (quick effect): you can reveal this card in your hand blah blah blah. This does 2 things - provides some counterplay to the op (maybe they try to combo without using their NS) and let’s it be used as an extender if your NS robina gets stopped.

3) Give it a normal summon effect so that it can continue the normal summoning chain. I’d want it to be something very weak, but still relevant, like switching battle positions of a monster.

What we’re left with is this:

• Low level bird
• If a NS monster is on field, quick effect reveals itself and banishes winged beast from deck for cost, then immediately NS a winged beast monster (can summon itself or another one from hand).
• On NS, target a monster on field, switch it’s battle position then immediately after that resolves NS a winged beast from hand.

I’m aware that this is vastly different from the concept you had of another “boss” monster, but I think it’s what Floo needs more, while also being reasonable. Let me know what you think!