This and Verelin Hangar are an attempt at capturing the flavour of (respectively) a big flying carrier of little flying machines and a hangar for little flying machines. Similar mechanically to Pentavus, and somewhat similar in flavour. I wanted a power clause in there as well, but the flavour gain wasn't worth the extra words.

They're somewhat restrictive designs: giving everything the Sengir Nosferatu ability could definitely get irritating, and if all flying creatures can flicker, that restricts how many ETB effects I can put on flying creatures in the block. The question is, is it worth it to get the funky flavour and interesting combos?

could you get the same effect with

": Tap target creature with flying you control and put a hangar counter on it." ": Remove a hangar counter from target creature you control and untap that creature. This ability may target creatures with Shroud as though they didn't have Shroud."

"Creatures with a hangar token don't untap during your untap step and gain Shroud."

May be a bit more clunky but avoids the flicker restrictions on ETB effects and can still protect them

could use similar wording on Verelin Hangar.

Removed the "if there are 3 or less" restriction. It was flavour-driven, but it doesn't add enough to be worth it.

This played well in playtesting. Useful but not overpowered. It has the entertaining unintended consequence that it can dock with itself to dodge side-effects of removal such as Direct the Explosion or Spectacular Failure.