More astrophysics dragons yeeeeeaaahhhh

Seiunryuu Nebula | Nebula the Star Cloud Dragon
LIGHT / Dragon / Level 8 / ATK 2000 / DEF 0
You can only use the (1) and (2) effect of this card’s name once per turn each.
(1) You can reveal this card and 1 Level 8 Dragon monster from your hand; Special Summon both, but their effects are negated, also for the rest of this turn after this effect resolves, you cannot Normal or Special Summon monsters, except LIGHT or DARK Dragon monsters.
(2) You can banish this card from your GY, then target 1 Level 4 LIGHT or DARK Dragon monster in your GY; add it to your hand.

Note of the resident space nerd: “Star cloud” is literally the Japanese word for “nebula“, but in English jargon it’s actually “a galactic region with higher star density than normal but not quite cluster-level”, so ¯\_(ツ)_/¯