It is cheaper and can still win you games just as effectively
If the creature is removed, you lose card advantage
That being said, however, a new Eldrazi Commander deck that arrived alongside Commander Masters did feature the powerful ability
Skip that whole mana cost thing for your artifacts
Gallery and List of Summon Cards The seven summons from the Commander Precons (FIC) are: Summon: Good King Mog XII Summon: Ixion Summon: Yojimbo Summon: Valefor Summon: Esper Valigarmanda Summon: Kujata Summon: Magus Sisters The 27 saga creatures from the main set (FIN) are: Summon: Bahamut Crystal Fragments // Summon: Alexander Dion, Bahamut's Dominant // Bahamut, Warden of Light Summon: Choco/Mog Summon: Knights of Round Summon: Primal Garuda Jill, Shiva's Dominant // Shiva, Warden of Ice Summon: Leviathan Summon: Shiva Jecht, Reluctant Guardian // Braska's Final Aeon Summon: Anima Summon: Primal Odin Clive, Ifrit's Dominant // Ifrit, Warden of Inferno Summon: Brynhildr Summon: Esper Ramuh Summon: G.F
Grolnok is everything you could want from a self-mill Commander in these colors: affordably costed, open-ended in deckbuilding requirements and templated to not lose its accrued value if removed