Bark beetle, bane of forests

On every players upkeep that player sacrifices
a forest.
If a player can't sacrifice a forest that player
loses 2 life.
"Pine beetles rarely cause widespread problems for the ecosystem as a whole. In fact, the beetles play important roles in ensuring biodiversity and forest succession. However, this historical trend has been disturbed by habitat alteration, increasingly frequent and prolonged droughts and commercial forestry operations." Greenarborists