Mana Gorger Tunnels

When Mana Gorger Tunnels enters the battlefield, sacrifice a land unless you discard
a land card from your hand.
Whenever a land you control is put into the graveyard from anywhere, each opponent sacrifices a land, then you may pay {1}{g}{r}. If you do, return Mana Gorger Tunnels to it's owners hand.
We'll drag you all down with us.