Cow Aurochs

Trample
Whenever Cow Aurochs attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.
Whenever an Aurochs deals combat damage to an opponent, for each damage dealt, create a 1/1 Aurochs creature token named Calf Aurochs with trample and "Whenever Calf Aurochs attacks, it gets +1/+0 until end of turn for each other attacking Aurochs."