For reference, Bill Cipher is a dream demon from Disney series Gravity Falls who, according to the Villains Wiki, has the power of: 

Immortality (via Quantum Uncertainty)  
Weirdness manipulation  
Oneiricpotence  
Oneiropathy  
Nigh-omnipotence  
Nigh-omnipresence  
Nigh-omniscience  
Genius-level intelligence  
Charisma  
Mastery of manipulation  
Intimidation  
Invisibility  
Nightmare inducement  
Extrasensory perception  
Flight  
Chronokinesis  
Voice mimicry  
Fantasy world creation  
Chaos manipulation  
Plot manipulation  
Possession  
Madness inducement  
Power bestowal  
Mind walking  
Animation  
Intangibility  
Pyrokinesis  
Power absorption  
Materiokinesis  
Alternate universe travel  
Hypnokinesis  
Electrokinesis  
Terrakinesis  
Umbrakinesis  
Ciphervoyance  
Dimensional awareness  
Illusion manipulation  
Fourth wall awareness  
Soul removal/absorbption  
Time and space distortion  
Duplication  
Future vision  
Pestilence creation  
Intangibility  
Elasticity  
Petrification  
Deflection  
Atmokinesis  
Energy beam emission  
Anger empowerment  
Astral projection  
Teleportation  
Shapeshifting  
Telekinesis  
Dimensiokinesis  
Regeneration  
Telepathy  
Geometric perfection

The Night Garden is probably Iggle Piggle's dreams.

It won't stand a single chance.

How long would the Night Garden last if it was attacked by Bill Cipher?