Depends on the form of you.
Informal form of you: Lo que es mío es tu y lo que es tuyo es mío.
Formal form of you: Lo que esmío es su y lo que es suyo es mío.
Do you mean like a weapon/ charging sword? That will be a rapier.
Answer:
Grass looks green.
Explanation:
Flowers smell sweet, sand feels rough, etc.