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To proliferate, you can choose any permanent that has a counter, including ones controlled by opponents

You do need to have a Princess or Queen in play for it to trigger though, so you'll have to ensure you have enough of them in your deck for this to reliably proc

Dont worry about making it perfect, or even pretty, just playable

Then, the Ballista can ping itself as many times you want, gaining a counter every time it does

Fortunately, with Maskwood Nexus being an Artifact, every color has at least one option for this type of Creature-changing effect

Anticausal Vestige The coming into the battlefield tapped is a big liability here, but otherwise this card seems great for decks looking to ramp with land