Unbound Shara Ishvalda

Menace, Trample, Double Strike, Dig
For as long as Unbound Shara Ishvalda is under
your control, you may use the mana of any
opponent as if it were your own, this ability works
on tapped mana as well
{3}{w}{w}: 4 target creatures gain last strike
for 3 turns
{10}{w}{w}: Destroy 8 creatures target opponent controls, for each land they control that opponent
takes that much damage