For one colorless, one black and one green, however, Polukranos can can fight another creature, so you can bounce this thing around the opposition
When Set Boosters first premiered, we did something we called connected cards where the commons and uncommons in one portion of the booster had a thematic connection between individual cards
You can decide to assign combat damage to the defending player or planeswalker even if the blocking creature has protection from green or other damage prevention effects applying to it
And the best way to ensure authenticity is to buy it from a reputable source
I stand behind what I said in my previous article, there is no right way to build a deck
The Selesnya section primarily offers support to the +1/+1 counters theme, which I suspect generally performs worse than more generically powerful options, but do suspect that the sacrifice combo with persist creatures, ways to make them re-enter the battlefield without -1/-1 counters, and sacrifice outlets that Autumn outlined in their article is worth keeping an eye out for at the very least