While it is all about abusing the kicker mechanic, it plays like a weird mixture of tempo and midrange, with a bit of ramp thrown in for good measure
It is similar to clouding, but with a key difference: while clouding is an internal phenomenon that permanently dulls the cards surface, dirt is external and comes from contact with dirty hands, unclean environments, or greasy/adhesive substances
At its entrance, Bloodtithe Collector causes opponents who have lost a life in that turn to discard a card, making it an interesting strategy for players after Turn 5 when it's more likely that their opponent has a more limited assortment of cards in their decks
That was disappointing then, but would be even worse for anyone who experiences that at todays prices
Note how it triggers on enchantments entering the battlefield, not casting them, just like Archon of Suns Grace and Setessan Champion