Secret Rares and Reverse Holos Secret Rare : A card is a "Secret Rare" if its collector number is higher than the official set number (e.g., 210/197)
The creature card you choose doesn't need to be a card you milled
Heres Baiy000r on his extensive testing with Bill in Wiggly decks: 4 oaks, 3 computer searches and 3 pokemon traders is the sweet spot of all my testing sessions
Personally I try to avoid running recursion effects that are one dimensional at this point, power creep has given us better options in a lot of cases, if you're in Black something like Lively Dirge can get back creatures, but it can also tutor one up if you don't have anything to get back
Its not enough to make a thing for one card, you need to make something that can be useful on five, ten, twenty cards, depending on the kinds of thing its meant to impact
Genesys has been having tons of hype behind it at YCS Events, where the player base blew the expectations that Konami had out of the water