In these colors, there are a lot of good upgrade suggestions
Urzas Saga helped a lot of archetypes becoming much stronger than they were before, adding a lot of consistency and an alternative win condition to their shells
As for border, long-time readers will know Im old border forever, and Tempest Mountains are my go-to
In a deck named after dragons, a large mana pool provides the basis for strengthening your board and generating high attack power
1 Grave Expectations Expect To Heist Heist is one of the strongest digital-only mechanics for Magic, and Grave Expectations is the easiest way to do so, only needing one black mana and nothing else
Anytime an opponent casts a spell with mana value equal to the number you pick, or they cast a creature with either power or toughness equal to the number you picked, that player loses two life and you get to draw a card