Canon spells I think fits Venus but no one has really mentioned or at least I don't think so:



Radical rainbow blast:

It creates a blast of rainbow lights.



Rainbow Avalanche :

It creates a blast of a liquid rainbow that can strike in multiple spots.



Rainbow Blast :

Shoots a rainbow, hearts, and winged bunnies at the target.



Rainbow fist punch:

It creates a rainbow with a fist at the end. ( has two other variations called ” Double rainbow fist ” and ” Rainbow fist grab”)



Glittery Heart Slap Blast:

Blasts the target with glittery heart-shaped energy.



Radiant Rainbow Bridge:

It creates a rainbow bridge. ( I feel Venus was too lazy to walk upstairs or want to make an entrance. One of the two

)



Rainbow Diaper Blast:

Magically gives the target a diaper and causes it to float.

(She got inspired when Galaxia and Condor gave her the chastity diaper. So as revenge she put them both in diapers or used it as a joke for Planet)



Rainbow Flytrap:

It creates a sticky rainbow-colored surface that acts as a flytrap. ( I read in a comment that you said Venus hates insects/bugs. And since you said she has a balcony in her room I really think she used it during the summer when fly kept flying in same for Star )