mtg play additional land cards Rites of Flourishing · Commander 2016 (C16) #163 · Scryfall Magic: The Gathering Search All 36 Play Additional Land

Partner with Pir, Imaginative Rascal (When this creature enters the battlefield, target player may put Pir into their hand from their library, then shuffle.)

In other words, Deathmark isn't that big an upgrade over removal spells that destroy most creatures, but Flashfreeze is a big upgrade over whatever answers you would use to cover alternative threats out of Red or Green decks

Back Crystallized Serah Legendary Artifact The first legendary creature spell you cast each turn costs less to cast

However, this can quickly spiral out of control if you dont plan for it

Until then, you can keep track of previews and teasers over at the MTG website

Its a $0.50, but one that sees play in pretty much every format somewhere