mtg modern horizons 3 most expensive cards of 3: See some of valuable The Most Expensive Modern Horizons

Thankfully, Rosewater clarified that were nowhere close to it currently, however, its clearly an option on the table

If your opponent discards a card while you control Leyline of the Void, abilities that check whether a card is discarded (such as Hollow One, or a madness ability of the discarded card) still work, even though that card never reaches that player's graveyard

Deluge Virtuoso looks like a card that will be fairly useful in most formats, as its fairly low cost, and has two super useful abilities on board

Building the Sideboard Building the sideboard is all about targeting troublesome match-ups while keeping your Niv hits high

After that, we need to find cuts to make room for new additions