In MTG Arena, they use only some of the official formats from the physical version which are the standard, historic, alchemy, and explorer formats
The Green one costs two, and then your four options are to shut off life gain from your foes, or Bolt your foes, or ramp out a land untapped, or give your team +1/+1 and reach for the turn
Nevertheless, Dig Through Time, like Treasure Cruise, was extremely powerful in Standard, very pushy but overall a really positive contribution to the format that helped make Khans of Tarkir one of the best-designed sets the game has ever seen
There are three new cards that shine in this deck, and they all have the new foretell mechanic
Desmond Miles #24 Assassin's Creed Change Version Desmond Miles Legendary Creature Human Assassin Menace Desmond Miles gets +1/+0 for each other Assassin you control and each Assassin card in your graveyard