In the current meta, taking into account competitive and budget considerations, the best deck for new players is Mono-Blue
Spider-Man 2099, Miguel O'Hara (SPE) $30 Like all SPE mythics, Spider-Man 2099, Miguel O'Hara has a premium price
Additionally, Rebecca is a popular card in Black decks, offering extra value by adding a black Character with a cost of 3 to 7 from your trash to your hand
Combined with your army of Myr creatures, these allow you to quickly attack for massive damage
Every creature in the deck is a giant, and even three of the non-creature spells, Feudkiller's Verdict, Favor of the Mighty, and Crush Underfoot have the giant subtype thanks to their tribal card type
Its probably strongest in Simic, Izzet, and the non-white, non-black shards and wedges, as youre less likely to be able to protect your permanents from battlefield sweepers