Ungoyo, City of Blades

Ungoyo, City of Blades enters the battlefield
tapped unless you control three or more Ninjas.
Whenever a Ninja enters the battlefield under
your control, put a Blade counter on Ungoyo. As
long as Ungoyo is untapped, Ninjas you control
get +X/+0, where X is equal to the number of
Blade counters on Ungoyo.
{t}: Add {u} or {b}.
{t}: Add {u}{u}, {b}{b}, or {u}{b}. Use this mana only
to cast Ninja spells.