We say that the people that say that are the fools, we actually have very big brains
As for the effect of the card - casting 7 CMC worth of instants isn't hard, so this can often be a 1 mana 4/4 flier that pings two - and if you happen to be in a pillow fort deck that can grant deathtouch to your creatures, that works just fine
Both cards are three-power Vehicles that cost two mana, have Crew 1, and provide value when they attack
Youre looking to combine goblin payoffs with cheap disposable artifacts here, so include all the usual goblin lords and cards like Skullclamp, Prized Statue, and Ichor Wellspring
Note this doesn't have a two mana tap tax like the Shrine
Marneus is even better in the lower brackets, where its abilities let you play a strong grindy game by keeping your hand and board well-stocked