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
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
Wulfgar is another of Drizzt's companions from Icewind Dale and doubles up triggers that result from attacking
How about a deck that forces opposing creatures to block