CardName: Dromoka's Vassal
Cost: 4{G/W}{G/W}
Type: Creature - Dragon
Pow/Tgh: 4/4
Rules Text: Flying
Dromoka's Vassal enters the battlefield with X +1/+1
counters on it, where X is the number of +1/+1 counters
among creatures you control.
Flavour Text:
Set/Rarity: Return to Tarkir Uncommon
Dromoka's Vassal
U
Creature – Dragon
Flying
Dromoka's Vassal enters the battlefield with X +1/+1 counters on it, where X is the number of +1/+1 counters among creatures you control.
I believe the correct wording is "on", not "among" (Fungal Behemoth)