A token that is a copy of another object has the same mana cost as that object
(To blight 1, put a -1/-1 counter on a creature you control.) Whenever a Goblin creature you control dies, each opponent loses 1 life and you gain 1 life
Note that once you sacrifice Skirk Prospector, you won't be able to activate its ability again, so if you'd like to sacrifice multiple Goblins including Skirk Prospector for mana, be sure to sacrifice Skirk Prospector last
Well, despite being sold out pretty much everywhere (despite a high asking price), HMV is offering the Revival Trance Collector's Edition Commander deck right now, and even looks to restocked the Counter Blitz and Limit Break Collector's Editions at the time of publication as well
Its a formidable creature
As a bonus, you also get some cat tokens, which also feeds the cat strategy of going wide