They are exhausting their customers by oversupplying, outpacing, and creating loyalty fatigue
Reanimator As the name suggests, reanimator decks rely on graveyard synergies and are built around bringing one (or a lot of) creatures to the battlefield
The 1st Edition uncommons in Shadowless packs mentioned in another thread (Identifying Shadowless & Unlimited Base set Boxes & Packs) could be an indication of such a surplus
The casualty ability is nice, but ultimately cards like this are too expensive for how little they accomplish when not used as a combo piece
Some cards are placed face down and can be triggered either at will or when certain conditions are met in the game
Collaboration is a great thing, as it motivates us to be our best self to support the work of other people involved, and as a result, we are becoming more than just the sum of work put in by each person on the project