Hi I am very new to the game except I have cards from 2005 and 2006. I am looking to play in organized tournaments and I am wondering if anyone can tell me where I can find the formats and what sets are legal in them?

Thanks,

Summers

Check the Support page for this game. Generally, no cards from when the game was a CCG are legal, as it is an LCG now. (Basically, if your cards have a rarity on them (C, U, or R), they are likely not legal.)