(Exile cards from the top of your library until you exile a nonland card with mana value 5 or less
This guide will help you with the best of them, blue, but the world is your oyster
Much of our focus over the past few years has been improving how Constructed-first players acquire cards and introducing new ways to help players, particularly those who are not interested in Draft play, get the cards they need to build decks
Then bounce them to your hand to keep them castable
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
(6/6/2025) Use the total mana value of other permanents you control as Summon: Bahamut's fourth chapter ability resolves to determine how much damage is dealt