Grimskull, Grave Marauder

Activated abilities of Skeletons you control and in
your graveyard cost {2} less to activate.
Other Skeletons you control get +1/+1.
{b}{b}: Regenerate Grimskull, Grave Marauder.
The grave bore no name, having been faded by time.
But from it, with the rusted tools of bloodshed long
past, rose a new legacy.