I wouldnt recommend playing Tithe in any deck playing green, as it doesnt put any lands youre searching for into play, but ensuring you can start with 2-3 lands and an extra color or 2 of mana earns it a slot in many decks
Whenever the final chapter ability of a Saga you control resolves, reveal cards from the top of your library until you reveal a Saga card
A great Background to pair Laelia with is Passionate Archaeologist, which lets you burn an opponent every time you cast a spell from exile
In addition to Cats, Foundations also has a lot of lifegain synergy going on in white
ETB/flicker decks rely on their creatures to deal with artifacts/enchantments, so Torpor Orb could lock a deck like that out of the game
I've had my best buys from Craiglist, but also some of my biggest time wasters