Spells and abilities that interact with activated abilities will interact with unearth, but spells and abilities that interact with spells (such as Flare of Denial) will not
Also the other theory was that due to demand for product in the beginning they sent out non stamped 1st ed cards until the unlimited versions were ready and thats how we have shadowless
Wizards continues to try new products as the set release schedule rolls on, and few of them were as big of a push as the release of Set boosters
TCG Factory is a wholesaler
I had the various Orbs of Dragonkind in the deck, but eventually cut them for more Dragons, except for Jade Orb, since it gives hexproof to whatever Dragon you cast with its mana, helping to ensure its survival until your next turn
From the card text, it leans naturally toward fair midrange and attrition, but it can feel more engine-driven if you add many ways to sacrifice creatures on demand