The Arkenstone of Thrain

Dwarves you control get +1/+1.
Whenever a dwarf you control attacks or enters the battlefield under your control, create a treasure token.
Sacrifice a treasure: put a gleam counter on The Arkenstone of Thrain. You gain 1 life.
{w}{u}{b}{r}{g}, {t}:remove all gleam counters from the arkenstone of thrain. each opponent loses life equal
to the number of dwarves you control, then the
amount of gleam counters there were on the Arkenstone of Thrain.