In the most rare case, this can be used as an instant speed Rampant Growth in response to a removal spell, but that's probably not what you want
Sacrifice after IV.) I Exile an instant or sorcery card from each graveyard
It comes in four main flavors: Mana rocks artifacts that tap for mana (Sol Ring, Signets, Talismans)
Even very controlling 18-land decks can just be 18 lands plus several cards that draw or fetch lands for you (Cultivate, Field Trip, Pop Quiz with access to Environmental Sciences, etc.) and skip the 19th land
I dont think Weaponcraft Enthusiast is actually a good card, but if Im going down the Cryptolith Rite road, both it and Channeler Initiate are making my deck, and sacrificing the 0/1 main body to -1/-1 counters is fine