Duncan, the Great Aurochs

When Duncan, the Great Aurochs enters the battlefield, create two 2/1 green Aurochs
creature tokens with haste and "Whenever this creature attacks, it gets +1/+0 until end of turn
for each other attacking Aurochs".
Trample, haste
Whenever Duncan, the Great Aurochs attacks,
it gets +1/+0 until end of turn for each other
attacking Aurochs.