One deep hole

All creatures have vigilance.
At the beginning of each player’s end step, tap all untapped creatures that player controls that didn’t
attack this turn. One deep hole deals damage to
the player equal to the number of creatures tapped
this way.
If a land tapped for mana, Plains produce {r/g},
Swamps produce {w/u}, Mountains produce {g/u},
Islands produce {w/b} and Forests produce {b/r}
instead of any other type.