First Card - Gemini with many effects

[PAINTAIN GOD OF DUNDA MT.]

[spoiler=(Corrupted AI)]
[IMG]http://i52.tinypic.com/23w40e8.jpg[/IMG]
[spoiler=(Lore)]
This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:
● If this card destroys a monster by battle, you can activate one of the following effects depending on the destroyed monster's Attribute: ●Light - Increase your life points by 500. ●Dark - Inflict 500 points of direct damage to both players. ●Earth - Destroy 1 card your opponent controls. ●Fire - Select 1 trap card from your deck and add it to your hand. ●Wind-Return 1 monster on the field to their owner's hand ●Water-This card gains 100 ATK.
[/spoiler]
[/spoiler]

Point out any errors.

[MibeR]

First of all, this is pretty good for a newcomer.

The card is balanced, but you got some errors, Here

This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:
● If this card destroys a monster by battle, you can activate one of the following effects [b]based[/b] on the destroyed monster's Attribute: ●Light - Increase your [b]Life Points [/b]by 500. ●Dark - [u]Inflict 500 damage to both players[/u]. ●Earth - Destroy 1 card your opponent controls. ●Fire - [b]Select 1 Trap Card from your Deck[/b] and add it to your hand. ●Wind-Return 1 monster on the field to their owner's hand ●Water-This card gains 100 ATK.

There's unbalanced start there, i spotted this is the troll only for EARTH, FIRE, WIND. The rest 3 is bit unuseful, though for FIRE it is overdoing without a drawback, so yeah. Should need a drawback for FIRE

[ragnarok1945]

WATER's effect is the only one that's meh

100 atk is a bit too little, I'd made it 200, but then cap the max at it can't exceed 3200 atk or something