Manahive

“Ravenous Amulet” is an artifact with lifegain and counters. Equivalent cards in black (matching color identity) that care about lifegain and get counters include:

• “Bloodthirsty Aerialist” (gets +1/+1 counters when you gain life)
• “Ajani's Pridemate” (white, but often played in Orzhov lifegain decks; gets +1/+1 counters with lifegain)
• “Crested Sunmare” (white; creates tokens on lifegain)

Closest black artifact equivalent:

• “Shadowspear” (artifact, grants lifelink/trample, interacts with lifegain themes)

Reason: All interact with lifegain and growing threats, just like “Ravenous Amulet.”