Sky Ruin Tablet

At the beginning of your upkeep, if you control
seven or more non-basic lands, you may Exile
Sky Ruin Tablet and target non-token permanent
an opponent owns. That player may pay 10 life.
If he or she does, put Sky Ruin Tablet into its
owner's graveyard. Otherwise, that player owns
Sky Ruin Tablet and you own the other
exiled card.