Thalia's Lieutenant

When this creature enters, put a +1/+1 counter on each other Human you control.
Whenever another Human you control enters, put a +1/+1 counter on this creature.

The List

Jumpstart: Historic Horizons

Commander 2020

When Thalia's Lieutenant enters the battlefield, put a +1/+1 counter on each other Human you control.
Whenever another Human enters the battlefield under your control, put a +1/+1 counter on Thalia's Lieutenant.

Shadows over Innistrad Promos

Shadows over Innistrad

If Thalia’s Lieutenant enters the battlefield at the same time as another Human, each of Thalia’s Lieutenant’s abilities will trigger. You’ll put a +1/+1 counter on both cards.