Gondolin, City of Stone

Gondolin, City of Stone enters the battlefield
tapped unless you control an Elf King.
{t}: add {g}, {w} or {u} to your mana pool.
{u}{g/w}, {t}: create a colorless Artifact Equipment
token with "Equipped creature gets +1/+1 and
has lifelink and first strike.
Equip {2} ({2}: Attach to target creature you
control. Equip only as a sorcery.)"