That player discards two cards
It lets us both shortcut to expensive effects like Bone Miser and Skirge Familiar or rebuild with them after a board wipe, when our other synergies might be temporarily turned off
Doctor Doom allows Connive to benefit you no matter the outcome: when you discard a land card, each opponent takes 2 damage, and if it's a nonland card, you still place a +1/+1 counter on the creature that Connived
Then whenever it attacks, you can bounce another creature you control, and if you elect to do that, it's unblockable
The Unfinity cards deemed too 'silly' for other formats, with mechanics that wouldn't work in normal play, now sport an attractive acorn stamp, marking them out as casual-only cards
Many cards, like Narci, Fable Singer and Tom Bombadil, are great saga commanders and let you build your deck around sagas