Collectible Card Game Headquarters

1 House of Cards deck is made forgeable by the new version, 1.6.34:

17.6.2004: Arrays in the Sun

4 From the Lab decks and 6 House of Cards decks are made forgeable by the new version, 1.6.38:

From the Lab
7.10.2013: Silas Waltzer's Recurring Titans
13.10.2011: Bacon; Inconceivable!
6.1.2011: Fruity Tokens

House of Cards
24.4.2008: Giantnapper
15.8.2007: Don't Block Party
21.6.2005: One Last Deck
2.12.2004: Back with Another One of Those Past-Blastin' Beats
5.8.2004: Subdual Dual
19.2.2004: The Night of 1000 Games

5 From the Lab decks and 3 House of Cards decks are made forgeable by the new version, 1.6.39:

From the Lab
26.8.2013: The Cheese
6.1.2011: Home for the Holidays
1.7.2010: Reverse Flash
15.4.2010: Shiptraining
11.3.2009: Kavu Power

House of Cards
14.6.2005: Nothing But Cheese
28.11.2002: Chess Is for the Birds
29.8.2002: All or Nothing

The biggest one would be to familiarize yourself with the later expansions/rules.  Also, as per the thread in the Tips & Tricks column, many of the later cards can more profitably be put in the sideboard to be pulled in to the play deck when you actually need them.

6 From the Lab decks and 12 House of Cards decks are made forgeable by the new version, 1.6.40:

From the Lab
25.8.2011: GGGGGGGGGGGGGGGGGG
2.6.2011: Flying Blind
27.1.2011: Darth Parallax's Infinite Universes of Chaos
15.7.2010: Hot Giants
27.5.2010: Double Tap
21.1.2010: Prides and Prejudice

House of Cards
3.4.2008: Out of the Bag
6.6.2007: Hawaii 8-0
26.4.2005: Kick Some S
13.1.2005: Phantom the Flames
29.7.2004: Heavy Metal
29.8.2002: Just Win, Baby
15.8.2002: Mine, Mine, Mine!; Please Own Call of the Herd; The Big Bewildering Boom
4.7.2002: The Star Spangled Banner Deck; The Star Spangled Banner Deck - Lite
9.5.2002: Wake Up!

5 From the Lab decks and 2 House of Cards decks are made forgeable by the new version, 1.6.42:

From the Lab
10.12.2009: Spite Moar-A
30.7.2009: Joost Linthorst's Birthday Deck
11.6.2009: Clerical Caste
8.4.2009: Manaless Pitch-orid
28.8.2008: Vermin Tank

House of Cards
29.5.2008: Boon Wound
5.9.2007: White as Pitch

1 House of Cards deck is made forgeable by the new version, 1.6.46:

4.7.2002: U.S.A. Deck (all-set version)