Tarkir: Dragonstorm , gave us a whole wave of powerful dragons along with fresh payoffs and support cards that make building around them even more exciting
Partial payments of the total cumulative upkeep cost can't be made
Here's how the deck looks with the upgrades added: Also to pre-emptively address some comments: one direction that you can take the upgrades is to really lean into Sliver Gravemother's encore ability and turn the deck into a straight-up Encore deck -- Buried Alive and Entomb cards to put slivers into your graveyard, Convergence of Dominion and Zirda, the Dawnwaker to make encore cost less (though PSA Training Grounds doesn't work, I see people suggesting it but sorry no), Mondrak, Glory Dominus to double the encore tokens, Sundial of the Infinite to keep the encore tokens permanently -- that sounds sweet and all but you'd need to do a massive rework of this entire precon, turning it from a Go Wide Sliver Combat deck to Sliver Reanimator essentially
Thus, set aside cards up to $3 in one pile
In this article, and go over a key piece of card draw for each color, so no matter the deck you're running - or its MTG color combination - you'll be able to draw cards with the best of them