lightning mtg cards Ball - Magic 2010 #125 (English) From the Theros set. Lightning, Army of One #400

You can either choose to deal three damage to each creature and each planeswalker, or you can destroy all artifacts with a mana value of three or less

Exalted and attack alone cards also go very well with double strike

For example, if Sandman is blocked by a creature with 4 power, and then an effect gives that creature -3/-0, it won't stop blocking Sandman

Three creatures included in the deck push the power of your creatures: Mad Auntie, Goblin Chieftain, and Judith, the Scourge Diva

While I won't go into detail regarding the choices of the list, I did want to share another design that I do think could use Helm well, and perhaps more efficiently

Combine Sliver Queen with Mana Echoes to generate infinite 1/1 Sliver creatures and infinite colorless mana