To illustrate this, if you have a Stormcatch Mentor and a Valley Floodcaller in play at the same time, then this happens: If you cast a spell like Slight of Hand - thanks to Prowess and the Valley Floodcaller, your Stormcatch Mentor is now 3 / 3 for the rest of the turn, just for being an otter with Prowess
Additionally, another card printed in Hidden Fates, Wheezing, triggered additional discard effects if it was discarded by Jesse & James
Sapphire/Steel has some really broken cards in it (Dig a Little Deeper) and actually has a coherent strategy that doesnt contradict itself
This overlap between value and playability is what makes OP-11 well-rounded
This can potentially save a couple of your creatures, even if it isnt the type of card you can rely on
Any deck with this ability as its main focus will have a fair amount of discard enablers