One (three?) of the most unique and interesting commanders out there, Sen Triplets is great
The exiled card gains 'The player who controls the permanent that exiled this card may look at this card in the exile zone.'" Any player who has controlled a permanent with a hideaway ability since a card was exiled with it may look at that card
She is [casthaven]Maelstrom Wanderer[/casthaven] without the gigantic target and the extra color identity
There are also quite a few good druid cards in the three colors, particularly green
There are also a handful of non-transform creatures that care about day and night, though mostly the mechanic was implemented to clean up the Werewolf experience, and the new execution looks solid
Also, Coram, the Undertaker enables you to play a land and cast a spell from among cards in graveyards that were put there from libraries this turn