It impacts shipping and material costs for protective boxes
That really helps to swell the enormous artifact count of this deck - as Necron Dynasties has 28 Necron artifact creature cards, and a whopping 49 artifacts in total
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(See rule 217.8, "Phased-Out," and rule 302.1.) 502.15c If an effect causes a player to skip his or her untap step, the phasing event simply doesn't occur that turn
Each has its own vibe and atmosphere, with creatures that are fun or foreboding, whether predator or prey
However, Cast Down is still another alright option, and in specific playgroups where Doom Blade / Go For the Throat aren't good options, Cast Down might end up being the correct choice