Sure, Demise brings a potential +2 to the Artifacts, but whats even more important is that it gives you an even better chance of opening Sanctum or Ignition, the two cards that win you duels
Either pay the regular spell cost, or pay more and get more benefits
If you are in the NYC area, Paradise Pawn sells and buys various trading cards including Pokemon, Magic the Gathering, etc
P/T Number 135 Language English Legal Formats Commander, Legacy, Modern, Pioneer, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Standard, Timeless Rulings (6/22/2015) Chandra, Fire of Kaladesh's activated ability will count any damage Chandra has dealt during the turn to any permanent or player, including combat damage
There are a lot of common aspects that you'll find in Riftbound if you're familiar with other TCGs: Units come out exhausted unless they have an ability to say otherwise, Runes create an energy that's accumulated to play cards etc