The five cards in this cycle are: Emeritus of Ideation Emeritus of Woe Emeritus of Abundance Emeritus of Conflict Emeritus of Truce These cards only share one feature, the fact that they all come with a spell attached to them which can be activated via the Prepare mechanic, added in this set
Faithless Looting The emperor of looters, the ruler of the graveyard
Throwing a creature away to get as much value as possible is their way of life, but how can you make use of Casualty
In the case of Thistledown Players, its definitely designed to pair well with other creatures that either have abilities that require you to tap them, or that you want to have available both for attacks and for blocks
That's all laid out in CR 707.2 with some additional details in the sub-rules of that section if you want to see it for yourself
There are synergies there