Tropical Island isnt far behind, either
A four mana board reset is great value, especially when you compare it to staple board wipes at that casting cost like Wrath of God
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
For one colorless, one black and one green, however, Polukranos can can fight another creature, so you can bounce this thing around the opposition
And the best way to ensure authenticity is to buy it from a reputable source