Seismic Shift

Cascade.
Destroy target land. Up to three target creatures
can't block this turn. If this spell cascades into
another instant or sorcery, add {r}{r}{r} mana
to your mana pool this turn. You can only use
this mana to cast instants or sorceries.
"You thought what I did before was an earthqake? No
this is an earthquake" - Zantha, The Exiled.