You won't cast Everflowing Chalice for 0 mana since its almost useless , but for 2 mana you get a 1-mana mana rock
While I happen to love goad as a mechanic, I had forgotten that Wizards had built us a commander specifically around it
The Fantastic Four Commander (4) Human Torch Invisible Woman Mister Fantastic The Thing Creature (16) Alicia Masters, Skilled Sculptor Black Bolt, Inhuman King Council of Reeds Crystal, Inhuman Princess Dragon Man, Reformed Robot Franklin Richards, Ascendant Galactus, Devourer of Worlds H.E.R.B.I.E., Lovable Robot Lockjaw, Slobbering Teleporter Medusa, Inhuman Queen Mister Fantastic, Reed Richards Namor, Atlantean King Power Pack Silver Surfer, Galactus's Herald Valeria Richards, Precocious Willie Lumpkin, Postman Instant (6) Bovine Intervention Clever Concealment First Family Galvanic Iteration Invisible Force Field Path to Exile Sorcery (23) Cleansing Nova Collective Effort Cultivate Cut a Deal Deep Analysis Expressive Iteration Fantastic Elasticity Farseek Flame On
This is one of the options for you if youre building a green creature-based Commander deck on a budget
If the target creature card is an illegal target as Golbez, Crystal Collector's last ability tries to resolve, it won't resolve and none of its effects will happen
Now, imagine all that power concentrated on a single creature