Idol of Oblivion is perhaps the most played draw option across decks that isnt Skullclamp these days, and for good reason
There are some dodgy mana battery style cards you can use, Jeweled Amulet, Wild Cantor, Pentad Prism, all of which have some merit in the deck but don't help you out at the start of your chain and as such are a lot less important than the Spirit Guide style cards
So many mechanics in Magic let you pay extra mana for some additional effect, which is exactly what kicker does on a fundamental level
If you love the idea of opening random treasures, a Collector Booster is an experience
Whenever it attacks, if the defending player has more cards in their hand than you do, you get to exile the top card of their library and play it on any turn you attack with a rogue
It feels not great for several reasons between being way too narrow most of the time, madness being a little tangential - even if it fits the deck's minor blood theme, and the flavor being off when Avacyn is dead