Magmasaur enters the battlefield with five +1/+1 counters on it. At the beginning of your upkeep, you may remove a +1/+1 counter from Magmasaur. If you don't, sacrifice Magmasaur and it deals damage equal to the number of +1/+1 counters on it to each creature without flying and each player.
"Full of beauty and grace, with a predator's instincts . . . Although she wanders, I have always thought Mirri belongs in Llanowar most of all." —Rofellos, Llanowar emissary
If Mox Diamond would enter the battlefield, you may discard a land card instead. If you do, put Mox Diamond onto the battlefield. If you don't, put it into its owner's graveyard. {T}: Add one mana of any color.