The lore connection is simple: psychic power overcomes brute force and mystical shadows
Note that he can target himself to draw two cards and leave a blinkable body behind
Karametra's Blessing also protects enchantment creatures, like the gods (Heliod, the Sun-Crowned) and other random creatures (Courser of Kruphix), which is a nice plus, but if I'm running Blessing it's because I'm looking to load up a creature with auras and I don't want to be blown out by an X-for-1
Have a look at the different in EV just based on the rares we know so far: If you squint, thats a potentially whopping 50%+ increase in the EV being added by rares in this set, assuming a roughly equivalent value for the remaining rares, including likely bulk rares
When all your options are low powered cards you take the one that does the thing you most want ot need and often that will result in this heap of cack getting learned
If you dont have access to a Dinosaur card to reveal at the specific time you want to cast Thunderheard Migration, then youre paying the same rate that weve been accustomed to in Standard, so it still isnt too bad