Energizer Mecha Thunder
So allow me to introduce, as DCotW #1, one of my personal favorites:
La Byle, Seeker of the Winds!
This is a great Light creature to have around, for several reasons. It costs 7 mana to summon, but such costs are definately worth it. La Byle is the Duelmaster equivalent of the Energizer bunny: it can keep blocking attacks, destroying small blockers or creatures in the process, and keep untapping and blocking, untapping and blocking . . . it just keeps going and going. I once used a La Byle to deflect eight attacks and destroy five of the attackers. Pretty good, huh?
It works best in an all-Light deck, or a deck with a heavy amount of blockers. If you need the mana to summon larger attackers, just send a La Byle in to sponge up attacks. Should a larger creature come up, just have it either break a shield, or take the blow with a smaller blocker to keep La Byle alive.
You can also put her under the Evolution Mecha Thunder, Kuukai, Finder of Karma, later on in the metagame.
For only 2 mana less, Kuukai provides a hulking 10500 power to deflect and destroy medium attackers, and will survive a lot longer than La Byle does. A properly Re Bil-enhanced Kuukai can deflect even the mighty Ballom himself.
Ballom's Rating: 4/5. Kinda weak, and a tad expensive, but it does its job well.