Rosa, Supportive Botanist

When Rosa, Supportive Botanist enters, create
Mango Fern, a 0/1 green legendary plant creature land token with "Protection from slugs." and "{t}:
Add one mana of any color."

Whenever you use a land creature's mana ability, put a +1/+1 counter on that creature. Search
your library for a basic land card or a land creature and put it onto the battlefield tapped. Shuffle your library.