Apologies for the dog shit formatting, but...
http://mtgtop8.com/topcards?f=LE&meta=39
Card Name Decks Avg
Brainstorm 57.7 % 4.0
Ponder 54.2 % 3.8
Force of Will 51.9 % 3.9
Polluted Delta 49.9 % 3.2
Wasteland 44.6 % 3.7
Volcanic Island 42.1 % 2.2
Deathrite Shaman 40.1 % 3.9
Tropical Island 39.2 % 1.4
Underground Sea 38.9 % 2.5
Misty Rainforest 38.1 % 2.4
Scalding Tarn 34.4 % 2.8
Bayou 31.4 % 1.6
Lightning Bolt 30.1 % 3.3
Flooded Strand 28.7 % 3.1
Verdant Catacombs 28.3 % 2.8
Gitaxian Probe 28.1 % 3.7
Daze 25.8 % 3.9
True-Name Nemesis 22.1 % 2.2
Delver of Secrets 21.7 % 4.0
Spell Pierce 21.7 % 1.8
Couldn't you just sleeve that up and play it as is?
Reformatting to separate lands and creatures:
The Legacy shell (35 cards)
4 Brainstorm
4 Ponder
4 Force of Will
4 Deathrite Shaman
4 Gitaxian Probe
4 Daze
2 True-Name Nemesis
4 Delver of Secrets
2 Spell Pierce
3 Lightning Bolt
Lands (25 cards):
3 Flooded Strand
3 Verdant Catacombs
3 Polluted Delta
4 Wasteland
2 Volcanic Island
1 Tropical Island
3 Underground Sea
2 Misty Rainforest
3 Scalding Tarn
2 Bayou
Cut 6 lands to go to 19, put in whatever unique flavor makes you special (such as Preordain), have 15 singletons as your sideboard. Deck to Beat.
I was going to compare the top few decks that made up the highest % of the metagame on there, but seeing that "most played cards" list being an actual Delver deck seemed easier.