There is no one Song. As Rand saw as he went through the ter'angreal in Rhuidean he saw when the Tuatha'an split from the Aiel. The man said specifically: We will go somewhere that we can sing in peace. Over the hundreds of years the "go somewhere to sing in peace" was mutated into "find the song".
When LTT asked Ishy if he had the Voice, and that it was soon time for singing, it referred to the second to last past Rand saw through his ancestor that those who have the Voice are chosen to sing to crops (amongst assuredly others things) with the Ogier and Somsheta. Those Voices hold the power of life and growing. Amongst being a moral core for the Aes Sedai during the Age of Legends, this was a task the Aiel dedicated themselves to.
You win a game you get a small amount of gold. (I think there's a daily limit to how much gold you can earn in a day)
There's daily quests for packs and gold.
1000 gold to purchase a pack.
Unknown how much it's going to be to purchase 'gems'.
They recently tested codes in Physical packs in New Zealand, that can be redeemed in MTGA just like Pokemon. Though it sounds like 1 in 10 nets you an actual booster pack.
My memory of the series is somewhat hazy, being some years since my last run through. However, I seem to remember an incident back in the AoL where the Aiel were sitting in a huge circle around a group of channellers that were killing them. They were singing as they were killed, trying to prompt the channellers to remember who and what they were.
As I say, my memory is very hazy on the point. I'll get back to the point on this read through eventually, but I always assumed The Song was that song.
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