Burning Wilderness

This land enters the battlefield tapped unless you control a forest or mountain.
{t}: Add X mana of any color where X is the
number of scorch counters on this card.
At the beginning of your upkeep, sacrifice a land,
then put a scorch counter on this card,
then each creature gets +X+X until end of turn,
where X is the number of scorch counters on this
card.
Remove a scorch counter from this card: Put a
+1+1 counter on each creature you control.