This deck features dozens of powerful creatures and spells with lifegain abilities, as well as a number of cards that provide powerful win conditions from life gain, such as Felidar Sovereign, Serra Avatar, Crested Sunmare, Aetherflux Reservoir, Angelic Accord, and many others
The Frog has a smaller body at 1/1, but it can block flyers with reach and then give it deathtouch with 2 mana so if you have it untapped and ready, people might avoid attacking you with grounded or flying stuff too in order to not trade down with a 2 mana 1/1
All of the other players brought decks like Grixis Shadow, UW Control, Grishoal Brand/Reanimator, Tron, Affinity, Death & Taxes, Naya Zoo, Burn, Mill, Storm, Ad Nauseam, Dredge, Humans, Merfolk, Spirits, Vampires, Zombies, BR Demons, Infect, UR Thing in the Ice, Izzet Drakes and various other decks
This deck isn't going to just be about Humans though, but also token generation, so you are going to want to include cards like Hero of Bladehold, which makes tokens and pumps your team in order to make a truly formidable regiment