With this i hit legend with a win rate of 62% (from Diamond 4) (26W - 16L).
IMPORTANT: This is a base list, but it will change based on meta, below I will write the cards that I consider good, you can modify it based on your choise.
Core Cards (11): Auto include cards. Here the base of the deck.
Luna's Pocket Galaxy: I like a deck based on this card, so i need more good big minion and less spell. We want to cast this card as soon as possible. Don't keep it against aggro deck.
Reno Jackson: Always keep against aggro.
Reno the Relicologist: Always keep against aggro.
The Amazing Reno: His hero power is not important, but his battlecry is too important to reset board and gain 5 armor. And i want all Renos in this deck, so i include it :P But it save our ass a lot of times.
Kazakus: Always keep in hand; create a 1-cost or 5-cost spell against aggro, 10-cost spell with polymorph against big priest and control lock and 10-cost with resurrect against control warrior.
Zephrys the Great: Always keep against aggro.
Dragonqueen Alexstrasza need no explanation, auto include in any Highlander Deck.
Tortollan Pilgrim; We use it mainly to play Galaxy, but is a good combo also with other big spells played in this deck like Blizzard, Puzzle Box of Yogg-Saron, Power of Creation or Ice Block sometimes.
Dragoncaster: We can cast big spell like Luna's Pocket Galaxy, Puzzle Box of Yogg-Saron, Blizzard, Power of Creation for free in turn 6, or a 10-cost Kazakus potion. But we need some dragon in our deck.
Malygos, Aspect of Magic: I like this dragon that give a very good spell, and his cost is not much high. but we need to include some other dragon in this deck.
Kalecgos: We need some good big dragons, this is one of the best.
Important Cards (12): Not the base of the deck but is better if you have.
Zilliax: Auto include in every deck, no comment.
Arcane Breath: We have a dragon sinergy, so this card is powerful, 2 damage and 1 spell. Always keep against aggro.
Blizzard: Important board clear, better than Flamestrike.
Power of Creation and Puzzle Box of Yogg-Saron: We need more minion and less spell, and we play Tortollan and Dragoncaster so we can include some big spell except Galaxy. I think these 2 are powerful and useful. Puzzle Box can save a lot of game in critical situation.
Siamat: Good to remove minion or put pression on the board. Or a big taunt when you need protection.
Ice Block: It can save a lot of games, always good. Give to us an extra turn that we need to survive and recover health and board.
Zola the Gorgon: I craft it and i'm happy cause is a good tool, you can copy you Reno and is gg vs aggro, or other good card. Zola give you a lot of value vs control deck.
Other cards (7): You can choose 7 cards that you prefer and based on meta. Here some suggestion you can choose between these, sometimes i will update the list on the right, but there is not a single list, i change it based on meta.
Here all the card that i prefer, and i think are good, i will update this list if i found some new good card to use:
Astromancer Solarian: In Standard work better, but i think is a good choise, cause is a early drop and the prime is a good card for late. Mainly i play it cause i like the effect but is not a must.
Firetree Witchdoctor: I like it cause you can discover a spell according to the situation. Sometimes a Polymorph against Warlock or a removal against aggro. Before i used Primordial Glyph, but i prefer this now cause is a 2/2 body good in early.
Flame Ward and Ice Barrier: Too aggro's deck in the last part of the climb, but with these two secrets you gain a little bit of time that you need especially against DH. You can replace them if that are not many aggro's deck.
Khartut Defender: Nice taunt + heal against aggro. I try it and its no bad.
Tell me the cards you like to use, have a good game and good RNG! :)
Update 1: I insert Zola, is too useful.
Update 2: I have insert Khartut. Now i have in total 58% WR, (99-71), with the current version : 73% WR (16-6), not bad this last one, i think is almost perfect for now.
Update 3: I played 260 games in legend with a total win rate of 58%.