Goldtooth the Graverobber

{1}{b} Sacrifice a land: create a black 1/1 skeleton creature token. Instead create a number of black 1/1 skeleton creature tokens equal to the number of opponents you have if you control the most lands.
{1}{g} Pay 1 life: return a land card from your graveyard to the battlefield tapped. Instead return a land card from your graveyard to the battlefield untapped if you have the highest life total.
Goldtooth the Graverobber's power is equal to the number of skeletons you control and his toughness is eq