Hall of Champions

Is there a list of all the Champion cards that have been Published in the LCG format?

There needs to be, but I haven't found it yet. So let's see:

Descendent of Eibon (2007)

The Mage Known As Magnus (2009)

Hall of Champions (2010)

The Festival (2011 - "Liege Champion" not World?)

Jeremiah Kirby (2013)

The Archmage's Attache (2014)

Missing 2006 (?), 2008, 2011 (?), and 2012.

Harry Houdini is the 2008 card. The Mage's Machinations is the 2011 card, post-errata.

mentor to vaughn is the 2006 card.

Questions:

1) If you trigger this, and there is one or more Champion cards in the ten, must you put one of these into play?

[I think the answer is yes, but I can't find a reference to back that up]

2) Can you fetch the Archmage attache ?
(which was designed by someone who happens to be a world champion, but not as a reward for a world championship)
 

And for the list:

2011: The Archmage, Arcanis

2014: Seer of the Gate

Questions:

1) If you trigger this, and there is one or more Champion cards in the ten, must you put one of these into play?

[I think the answer is yes, but I can't find a reference to back that up]

 

2) Can you fetch the Archmage attache ?
(which was designed by someone who happens to be a world champion, but not as a reward for a world championship)
 

And for the list:

2011: The Archmage, Arcanis

2014: Seer of the Gate

1) Yeah, I think so. I'm trying to imagine the situation where you wouldn't want to, and I'm coming up a little empty. If what you found was a second copy of the Hall of Champions, you wouldn't be allowed to.

2) I think The Festival (Liege Champion) and The Archmage's Attache (North American Champion) are both ineligible.

So that means here's the complete list, pending one card:

Mentor to Vaughn (2006)
Descendent of Eibon (2007)
Harry Houdini (2008)
The Mage Known As Magnus (2009)
Hall of Champions (2010)
The Mage's Machinations (2011)
The Archmage, Arcanis (2012)
Jeremiah Kirby (2013)
Seer of the Gate (2014)

Of the possible targets (not counting the Hall itself), 6 out of 7 are sorcerers, and five of these are unique. All are neutral except for 2 Miskatonic and 1 Yog-Sothoth.

To me, the obvious choice for a Hall of Champions deck would be Yog/Twilight with big sorcerer-leveraging. Something like this:

Character: (30)
1x Mentor to Vaughn (Kingsport Dreams)
1x Descendant of Eibon (The Terror of the Tides)
1x The Mage Known as Magnus (That Which Consumes)
2x The Archmage, Arcanis (The Mark of Madness)
3x Seer of the Gate (The Mark of Madness)
2x Magnus Stiles (Shadow of the Monolith)
2x Nephren-Ka (The Sleeper Below)
2x Yog-Sothoth (The Key and the Gate)
2x Student of the Profane (Spawn of Madness)
1x Sebastion Blake (Denizens of the Underworld)
1x Nadine Eskiy (The Key and the Gate)
1x Mystic Bounty Hunter (Core Set)
1x Monsieur Lamar (The Mark of Madness)
3x Lost Oracle (The Key and the Gate)
2x High Wizard of the Order (The Order of the Silver Twilight)
1x B. Ramsdale Brown (The Key and the Gate)
1x Carl Stanford (Seekers of Knowledge)
3x Blood Magician (Conspiracies of Chaos)

Support: (8)
3x Hall of Champions (Written and Bound)
2x 9th Ward (The Thousand Young)
3x Enchanted Gargoyle (The Mark of Madness)

Event: (12)
3x Eldritch Nexus (Core Set)
3x Invocation of the Abyss (The Mark of Madness)
2x Vortex of Time (The Key and the Gate)
1x Brazier Enchantment (The Order of the Silver Twilight)
1x Secret Handshake (The Order of the Silver Twilight)
1x Initiation (The Order of the Silver Twilight)
1x Twilight Ritual (Twilight Horror)

When you're told to "search" your deck in other games (like Magic, for instance), you're not actually forced to find an eligible card.  I think if Hall of Champions told you to "reveal" 10 cards, that might be different.  But since the Hall doesn't make you show the 10 cards you're looking through, there's no way for your opponent to enforce the outcome of your search.  

I can see how you might not want to find a copy of The Mage's Machinations because you have some valuable character on the board that you can't afford to lose.