Zrikar, Eye of Undeath

Whenever another skeleton you control dies, you
may pay {p/b}{p/b}, if you do, return that skeleton
to the battlefield tapped at the beginning of
the next end step
Sacrifice another skeleton: gain 2 life
{p/b}{p/b}{p/b}{t}: return any number of target skeletons
with total power 2 from your graveyard to the battlefield under your control