Endless Treasures + Treacherous Land.
Both of these cards are similar to BotC in that they are an engine in and of themselves. With the powerful reprinted curses, many of which are battlewinners if played as EEs, Endless Treasures is an amazing tutor that also rewards you with a D2.
Treacherous Land was really strong for me in playtesting, and its ability is the same as when I playtested. I usually draw 6-8 cards with it if I get it down early.
The fact that these two cards have additional synergy is simply amazing:
1. Endless Treasures can activate a curse, which triggers Treacherous Land, allowing you to underdeck an evil card from Reserve.
2. Endless Treasures underdecks itself to prevent players from activating it too often. Treacherous Land can let you draw the bottom card of deck when an opponent plays a mutli good card in battle or a Dom, getting ET right back into hand.
I'm going to be testing some decks that basically have most of the defense in the Reserve, to be fetched with these two cards and The Deceiver.