Outside of lots of extra material for sacrificing, its also a potential tool for token strategies and devotion strategies (since it leaves four black mana symbols on the battlefield instead of zero like most token makers)
The Nethroi, Apex of Death deck is full of redundant pieces in each of the main categories
Fantasy Flight Games unique card game relies on procedural generation, automating the process of design and generating a potential 104 quadrillion different decks
6 Runaway Trash-Bot Artifacts and enchantments are two card types that aren't seen together very often, but Runaway Trash-Bot provides a decent incentive for any deck with a large number of these two card types
Unsummon can bounce your creatures for reuse, including Persistent Nightmare if needed, but Ive overall not found it to be worth a card
This is a really beautiful artwork with some fantastic colours that really showcase the Pokmon nicely