Anyway, I have to second Sun Titan works well with your aura theme
Setting up Zombie World is easy as both Armageddon Knight and Mathematician are able to send Necroworld Banshee from the deck to the graveyard
For a while, I had been working on several artifact decks to abuse a little card called Tolarian Academy, including several that played Voltaic Key just to have another artifact that occasionally came in handy
Homelands , the very next set, had four (Headstone, Jinx, Prophecy and Renewal) all done with the same wait-until-next-turn text
For example, the 4-limit rule does not mean that you may only have four Mickey Mouse cards in your deck, just that you may only have four of a specific Mickey Mouse card
For example, Mirror Entity and Maskwood Nexus can turn Creatures into Shapeshifters with all types