This blue-red deck focuses on goading your opponent's creatures to attack each other rather than you, and then you follow up with powerful dragon attacks
Accursed Witch, Edgar, Charmed Groom, Golden Guardian, Harvest Hand, Loyal Cathar, Vengeful Strangler and the Deepest Gods cycle have triggered abilities which return them to the battlefield transformed when they die
So, for a total of six mana, you can make Zack a respectable 4/6 with the Buster Sword equipped
Ephemerate is probably strongest in 4c Elementals, where every creature has a threatening ETB that can value-spiral out of control quickly
The effect to make a creature unblockable comes up as well when combined with cards that grow in stats when you cycle a card
How about a deck that forces opposing creatures to block