Until end of turn, you may cast a spell from among those cards
Alela, Cunning Conqueror, Tegwyll, Duke of Splendor, and Alela, Artful Provocateur are the most popular faerie commanders featuring Feywild Visitor in the 99
(Again, this is explained in further detail in my column on the design of double-faced cards.) The road to the Werewolf mechanic began not down the design path of double-faced cards, but rather down the path of designing the day/night mechanic
Garruks +1 allows you to give a creature +3/+3 and trample until end of turn
Cards like Mishra's Bauble offer a peek at the top card of a player's library and replace themselves at no mana cost after their sacrifice
There is the possibility you deck yourself, but I love embracing the random