Golos, Rodent Tyrant

All rats and squirrels have trample.
At the beginning of each end step, create a 1/1 green squirrel rat creature token for each opponent that was dealt damage this turn.
Then put a +1/+1 counter on each creature you control that is a squirrel and/or a rat.
At the beginning of your upkeep, you may sacrifice a squirrel or a rat. If you do, draw a card.