As an added bonus, I was actually able to explore a real life Skyclave and came back with some extraordinary kor artifacts (lovingly rendered by artistic whiz-kid Jeff Carpenter)
Like we just mentioned, because of the guaranteed access to rare cards in Collector Boosters, they command a significantly higher price than a Play Booster: the MSRP for a Final Fantasy Collector Booster is a whopping $38 , compared to the $7 for a Play Booster
Both of these items abilities require you to exert the card and pay the ink cost to use them
You can see the spell grants a creature you control an ability that triggers when it dies and that ability makes another creature stronger
A self-mill sub-theme with the likes of Patchwork Beastie and Fear of Missing Out could help a lot too, in terms of filtering through to the pieces you need
With new sub-types of lands usually they only introduce a few and it's kind of meh, if there are enough towns you might be able to do neat things with them, there's already an obvious town commander in Wandering Minstrel, but they'll probably end up being pretty inconsequential there