MANAHIVE

Closest equivalents (all Emblems, colorless, help similar tribes or effects):

• Kaito, Bane of Nightmares Emblem (your searched card)
• Ob Nixilis Reignited Emblem (gives an emblem, colorless, but effect differs: opponent loses 2 life on draw)
• Garruk, Apex Predator Emblem (gives emblem, colorless, creatures you control have deathtouch)

True equivalents for Emblems boosting Ninjas specifically do not exist. Generic colorless emblem examples boost or grant effects to creatures, but none to Ninjas or +1/+1 specifically.