Ruins of Ixia

Ruins of Ixia enters the battlefield tapped.
{t}: Add {b} to your mana pool.
As long as Ruins of Ixia is in the battlefield, all skeleton creatures you control gain +1/+1.
"Wearily you press on through the awesome ruins of
this age-old city, until you are forced to halt and take
cover from a passing troop of skeletal warriors."
- Joe Dever