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
It was powerful, flexible, and most importantly: fun
That's because The Ooze's triggered ability checks the creature's existence just before it leaves the battlefield, and it still has all those counters on it at that point
Throwing a creature away to get as much value as possible is their way of life, but how can you make use of Casualty
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
There are synergies there