This has an interesting effect: While many good artifacts are worse at what they do than the best colored card with a similar effect, said artifact is often amazing in decks without access to that color
While the previous incarnation of Craterhoof was a giant spiny reptile, on Tarkir it appears to be a giant green mammoth, with foliage growing from it like an elemental
Cavern of Souls is designed to support typal strategies
You will also be presented with three options for your second packet
Then you can swing through any defense for a damage, making this good at defensive decks as well as Voltron decks looking to kill in the red zone with equipment and auras like Rancor
Best Colorless ETB Payoffs The best way to take advantage of ETB triggers, regardless of color, is to double up on those abilities, or at least copy them