If you absolutely must merge the greatest evils in the multiverse together, Cats and Phyrexian packs are waiting for you
Cards that include the Venture keyword will span the spectrum of card rarity in Adventures in the Forgotten Realms, down to common cards such as the new Shortcut Seeker
Undead Alchemist converts milled creatures into your own creatures, which themselves can attack for more mill
Turns out, there are quite a few ways to get around that little sacrifice clause, letting you get two activations of their enter the battlefield triggers, which is a bit too good to let run rampant
The creature itself is a good flying threat to put onto the battlefield, but its real power comes from its ability to flicker all non-land permanents you control
Unfortunately, decks with lots of removal can kill this before the first trigger (it dies to Doom Blade), but it can be the nail in the coffin against aggro decks