Most players tend to take the card to avoid falling behind on value, which keeps your life total healthy
You can also just increase Polukranos's power/toughness with something like Eldrazi Conscription, which means Polukranos will lose his counters but not die due to them
Two Willpower makes him more vulnerable (and puts him in range of a Grab Your Sword), but you shouldnt be wanting to keep him in play forever anyway
I had several waifu trainers in my collection that rose huge in value during the bubble(early july peak seems), I stupidly did not sell and just held thinking the 1000s$+ price tags would hold longer than they did
Create a token that's a copy of one of those creatures, except its power is equal to the total power of those creatures, its toughness is equal to the total toughness of those creatures, and it's a colorless Eldrazi creature
Vurdurous Gearhulk 7.5 This is a bit of an odd one