In this case, the spell side provides an infinite-hand-size emblem while drawing you lots of cards, and the Sea Gate, Reborn side is an untapped mana source if needed early on
For example, you can either cast Bonecrusher Giant for two generic and one red, or cast it as an instant with Adventure called Stomp for one generic and one red
Wolfwillow Haven is probably the closest Standard-legal comparison we have at the moment, and whilst that card is certainly not a staple of the format, it has popped up briefly from time-to-time
Take a look at the four figures in The Prismatic Bridge and youll see the brute sides of the other four cards, starting with Bloodline Keepers back face, Lord of Lineage, on the far left
This might seem boring, however, it saves this list from being several copies of the same card over and over again