For example, with the new Vivien, Champion of the Wilds, you can cast your werewolves on the end step before your turn, then not cast anything on your own turn, transforming your werewolves (if nobody else casts an instant spell)
It punches farther up the curve than similar effects, but rewards you for the extra mana investment by giving you two extra ETBs per turn
I've since pulled out all that fast mana and I haven't been drawn to play the deck very often, but I'm not quite ready to pull the plug on it
It also gets Rampage, which allows it to become stronger if it's blocked by more than one creature
Flavor-wise, the card looks like a futuristic Tim Schafer-esque version of the Disney ride Its a Small World, which is so incredibly selcouth