Well, they either end up there through [c]Entomb[/c], which puts a card directly from your library to your graveyard, or [c]Faithless Looting[/c], which lets you draw your Reanimate cards and discard your Griselbrands
Commander Devotion is certainly viable in EDH, either as a payoff/choice for your commander (with one of the many available gods helming your deck) or as individual card choices
For example, you may still want to bring a Standard deck to play for fun between rounds, a trade binder, pen and paper to keep track of life, and even a water bottle
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Mass destruction (to use while some of my stuff is phased out) Roon can be used to change the turn sequence a phasing card is on, to help get your phasing creatures in sync
1 Sludge Monster