The ward cost is harsh and amass for every opponent's spell really adds up
Modal Double-Faced Cards (MDFC) The newest addition to Magic's family of double-sided cards are MDFCS
If your deck isnt working or whatever, stick it out for the benefit of the other players in the game
If you have access to a lot of mana, you can have really explosive turns with lots of Slivers going out against every opponent at the table
Right now I have it in so that I have something good to return with The Mending of Dominaria, but maybe a better plan is to use Bone Dragon and not The Mending of Dominaria, either just relying on Devious Cover-Up or possibly using Bone Dragon to sculpt your graveyard for Gaeas Blessing, though that sounds like the kind of late-game nonsense that will never actually come up, whereas Gaeas Blessing messing up your Bone Dragon will come up
But if time is the limited resource that is spent flipping sieges, players will probably prefer a more meaningful threat to reward them for that effort and hopefully end the game sooner