A madness (yeah, D. stand for discard) of sinegies between mediocre but fun cards. Don't be a slave to the colour combinations, your deck can be anything you want, but just as guidelines the main themes are based on shards:
Bant: Spirits
Esper: Zombies
Grixis: (self)Discard
Jund: Automill
Naya: Flashback
Recurring themes are tokens, cycling, and graveyard matters.