(The first is answered by figuring out how much of the field I need discard against, and the second by how much discard is required to actually beat combo decks.)
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
Its an awesome threat in decks that require players to sacrifice creatures each turn because this card can grow fast when people are sacrificing creatures left and right
Charizard cards go for 150, Lugia ones for 149.99 and Umbreons for 142
The Brothers War Set Booster Box contains 30 The Brothers War Set Boosters
This is great news and will help the deckbuilding in these colors go a little bit smoother