Evergrowing Land

{t}: Add X {g} or {w} non-basic mana where X
is half of your life total rounded up.
Destroy all non-black basic lands. If you have
10 or more mana, your life total becomes 30
and you gain hexproof for 3 turns.
Even through the most deadliest and destructive war Ravnica has ever seen, the Earth still grows and life always continues.