The final two cards, Harbinger of the Seas and Winter Moon, are both cards that impact lands and can unfairly shut out your opponents very easily
Flanking means "Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn." If a creature gains flanking during combat, that has no effect on any creature already blocking it
That seems to be just for flavor, and summon doesn't have any impact on the rules that we know of
Now that we answered that question, lets move on to the next one: How do we win
We're representing that concept with the proliferate mechanic, which lets you add more counters to permanents and players that already have counters on them
The SP cards in this pack feature designs that capture a snapshot of various characters daily lives