Essence Extraction: Heavy cost for the damage it deals, and gaining life is usually a game-losing strategy
I actually find it interesting that a key aspect of the religion was to consume the life force of another
Convergence of Dominion makes unearth abilities cheaper, but it likely has other applications outside of this precon
Its safe to assume that we will witness the end of all abilities, tokens and copies of spells
The good part about Discovery / Dispersal is that its good early and late in the game, and you can cast it with blue or black mana
Despite this, there are a number of notable non-blue counterspells that are powerful and oftentimes terrifically surprising as most Magic players will not be expecting a counterspell to come from someone playing, for example, a Gruul (red/green) deck