We have Aristocrats, self mill, Delirium (and others like Spell Mastery, Threshold) and flashback (and others like eternalize and disturb) Ogre could be interesting for all sorts of graveyard themes including reanimator and Delirium
Now, a secondary ability of Muzzio is to be a good Commander for such a deck
and then six cards again later for four more mana
(If unsolved, solve at the beginning of your end step.) Solved Sacrifice this Case: Creature cards in your graveyard gain "You may cast this card from your graveyard" until end of turn
Finally, don't sleep on rituals, instants (and, rarely, sorceries) that trade a card in your hand for a quick burst of mana
If you controlled a creature with power 4 or greater when you declared Ruby as an attacker, it doesn't matter whether you still control one as her triggered ability resolves