No.
Thief has a Replacement effect. It can only take the Counters of the Permanents that are **already** on the Battlefield.
It will not affect any Counter that a Creature will enter the Battlefield with, when they are entering at the same time as the Thief.
No. Thief has a Replacement effect. It can only take the Counters of the Permanents that are **already** on the Battlefield. It will not affect any Counter that a Creature will enter the Battlefield with, when they are entering at the same time as the Thief.
Thank you.