A lot of decks that tend to take themselves (or rather I take them for) a bit too serious needs a bit of a 'kick' provided by the ever so cheeky Morgans Tarot.
Some decks if they feel a bit too foreign to me can benefit from added insight by an old 'comfort deck'. My comfort decks are Spiral and Gill.
For some time, years ago, I read a lot with Aquarian and Gill simply cause the first seemed a bit lofty and pompous, yet really nice and the Gill a bit warmer and sharper, like a needle to a balloon if you like.
I only got one oracle and it is just too chatty to add to any other deck. Those Faeries of Froud wants ALL the attention.