I think first and foremost, its finding the right IPs that are great adjacencies to what Magic fans might appeal to or what Magic might appeal to another fan base
Again, its a great way to get a decent amount of packs, with a nice box to store and sort your decks and spares
Commander Masters is also the first Masters set that comes with its own Commander decks, each of which include some brand new cards
You just need to include them
It has a decent mana value, which allows Yurikos trigger to ding your opponents for five if it gets flipped
Like most Magic: The Gathering cards, the value of Tiamat depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Adventures in the Forgotten Realms)