I think that it is too early to start a tournament because there are curretnly a few active users. It's better to wait till summer. However, in competitions like COTW can participate everyone who signs in at least once per week. I think it's a good idea to create a competition named Archetype of The Month with the following rules:
1. Every month there will be a specific theme in what archetype you may nominate, for example "The best archetype in GX era", "The best Archetype which focuses on swarming" or "The most Broken Archetype"
2. Each member can nominate one Archetype.
3. You can't nominate the Archetype who won in the previous month.
4. You may nominate Archetypes which have been only released in the OCG.
5. According to the number of Archetypes in the poll you are allowed to vote for more than 1 Archetype:
for 2-4 archetypes: 1 vote
for 5-7 archetypes: 2 votes
for 7+ archetypes: 3 votes
The only problem is that there isn't a wide selection of Archetypes (that's the reason I proposed to be a monthly competition)
What do you think?