Here Comes the Thundah!

|Raigeki, the Soul Thief|0||Warrior/effect|Light|4||????|1500|If this card is removed from the field and sent to the graveyard, Special Summon it to your side of the field during your next Stand By phase. This card's ATK is equal to 200x the number of LIGHT monsters in your graveyard. Once per turn you can discard 1 LIGHT monster from your hand to target one monster on your opponents side of the field. Unless your opponent can reveal a monster from their hand with an ATK higher than this cards ATK, the targeted monster is destroyed.|

|Aviel, the Lightning Sorceress|0||Spellcaster/effect|Light|5||2000|1800|This monster can be Normal Summoned without Tributes if you have 3 or more LIGHT monsters in your graveyard. Once per turn you can target 1 LIGHT monster on your side of the field and send it to the graveyard. Inflict effect damage to your opponent equal to the ATK of the targeted monster. If this monster would be destroyed by card effect, you can discard 1 LIGHT monster to negate the effect and destroy the card. When this card is removed off the field, you receive damage equal to 100x the number of LIGHT monsters in your graveyard.|

Both of them seems okay, I like Raigeki thief more.

These are pretty awesome and creative makes good LIGHT decks.