You can play a land only during your turn and only if you have an available land play remaining.) Normally, playing a land can only be done as a sorcery, but the madness trigger circumvents that timing restriction, allowing you to play the land even if it's not your main phase and even if the stack is not empty
Black-Blue-Green are the Sultai, who revere their dead and trawl through the graveyard, all the while persisting and controlling the board Green Blue Red are the Temur, all about casting big powerful creatures, generating the mana to do so, and annihilating the opposition in a rain of dragonfire
2 Miku, The Renowned (Feather, The Redeemed) Play It Back Again Miku, The Renowned is a reskin of the great legendary creature Feather, The Redeemed, and this card has a track record of being a strong commander
Getting from being someone that knows nothing about the game to being able to play your first game of Magic with confidence is a pretty big gap