Kiln Fiend is a two-mana 1/2 that gets +3/+0 whenever you cast an instant or sorcery spell until the end of the turn
Black stitched edges offer an added premium feel
Most formats let you include up to four copies of a crucial card, so you can improve your odds of drawing it by adding multiple copies (basic lands aside, which you can include in any quantity)
The former will also trigger when opponents attack, too, which takes advantage of Isshin
To be honest, Unravel will probably not see much play while both Cavern of Souls and Three Steps Ahead remain in the format, but I do find this card quite interesting
This low cost creature deck was incredibly resilient to board wipes and placed your opponent on a fast paced clock, in which they needed the right answers fast or would be wiped out