They are the same 37 cards that you can find in non-foil in the summer Collector Booster and include cards such as The One Ring, Palantr of Orthanc, and Delighted Halfling
Then, whenever you gain any life, it puts a +1/+1 counter on a target creature or enchantment
TCG Pocket vs TCG Live All Differences Explained Updated 1/13/2025 All differences between Pokemon TCG Pocket and Pokemon TCG Live
You will also need a playmat, some local stores provide them but for bigger tournaments you will definitely need to take your own
The Mana production was from Burnt Offering, by sacrificing a creature, and Song of the Damned, by adding Black Mana based on the number of creatures in your graveyard, both cost one Black Mana and could be used efficiently to get more Mana from one spell than a Dark Ritual, which was also reprinted in Ice Age
You might have run into an article or two, or came across a stream of people playing