Grizzled Squire

Odyssey (This creature begins at the first prerequisite.
When you meet the current prerequisite, advance to
the next prerequisite and put a +1/+1 counter on this creature. Stop after III.)
I: Grizzled Squire and at least two other
creatures attack.
II: Grizzled Squire attacks alone.
III: A 1/1 creature enters the battlefield under
your control.