Yeah, works for me. Kinda bummed it ruins the odd number aesthetic but I can see the issue.

Reworked with both your and Stan's suggestions taken into consideration.

Name: W Nebula - Galactic Kingdom
Type: Field Spell
Effect:
*When a Reptile-type "Worm" monster is Normal Summoned or flipped face-up: place 1 Worm Counter on this card.
*All Reptile-type "Worm" monsters on the field gain 100 ATK and DEF for every Worm Counter on this card.
*Once per turn: You can remove 1, 3, or 6 Worm Counters; Activate the corresponding effect:
**1 Worm Counter: Immediately Normal Summon a Reptile-type "Worm" monster from your hand with 1 less Tribute.
**3 Worm Counters: Add 1 "Worm" or "W Nebula" card from your deck to your hand, except "W Nebula - Galactic Kingdom".
**6 Worm Counters: Change the battle positions of all face-up monsters on the field to face-down Defense Position. Monsters changed to face-down Defense Position by this effect cannot change their battle positions until the opponent's next Main Phase 2.
Image: An expansive nebula with two intense stars near the top, looking suspiciously like the signature Worm eyes.