I'd love to use my ancient gear deck, but they're too weak compared to all those xyz and synchro decks, and they're not completely invulnerable to spell and trap cards.
Arrrgh I'm still unsatisfied with how my deck goes...... damn you Angel 07 for being so complicated.... lemme make 1 more edit to it, then I'll probably stop there.
Apparently all timelords have a "rare" rarity, except for Sephylon, which is "ultra rare", and the rules do say to refrain from using painfully rare cards. Let's see what Rethel has to say, though.