Playing against these decks is something many MTG players dislike, especially in their favorite casual formats like Commander
I assume this is highly desirable, particularly in the artifact decks that just want cheap artifacts that do things
It's a red Lhurgoyf creature that costs three generic and one red mana, and has a classic Tarmogoyf statline - its power is equal to the number of card types in all graveyards, and its toughness is that number plus one
You can see the XXX/500 numbering in the above image
While Kari Zev wasnt an incredible card in terms of power level, it put in solid work here and there, and when it did people saw, and loved, Ragavan
It requires setup, and the opponent isnt going to be sacrificing essential permanents right away, but this is the right spell when the right situation is on the board