Later on your turn once you've done some life loss to your foes (which is mega-easy, and note that the Theater has that as a built-in trigger), then you'll be set and you can play any of the cards you exiled, even ones previously
His mechanic also depicts the entire concept of Advantage Rolls in Dungeons & Dragons, but unfortunately, we don't see him doing any Eldritch Blasts or Arms of Hadar, but you just can't get everything you want these days

Lets have a look at a sample decklist that was played in a Magic Online Challenge by player wiky: Planeswalkers (5) Narset, Parter of Veils Teferi, Time Raveler x2 Jace, the Mind Sculptor x2 Creatures (4) Snapcaster Mage x2 Monastery Mentor x2 Instants (15) Brainstorm x4 Swords to Plowshares x4 Force of Negation x3 Force of Will x4 Sorceries (14) Ponder x4 Preordain x2 Prismatic Ending x4 Expressive Iteration x3 Terminus Enchantments (2) Dress Down x2 Lands (20) Flooded Strand x4 Island x4 Mountain Plains x2 Prismatic Vista x4 Scalding Tarn x2 Tundra Volcanic Island x2 Sideboard (15) Hydroblast Pyroblast x2 Red Elemental Blast Surgical Extraction x2 Containment Priest x2 Ethersworn Canonist x2 Back to Basics x2 Izzet Staticaster x2 Wear // Tear Thanks to the printing of Prismatic Ending in Modern Horizons 2 , this deck has the ability to deal with virtually any troublesome permanent it comes across

Paying 2 life to have them come in untapped helps you to stay on curve, and in decks like Death's Shadow, that life loss is actually a bonus
A bunch of extra Rampant Growths and artifact tokens on top of a creature that improves your taplands all adds up to a powerful package
The Balrog of Moria The Balrog of Moria is just a big commander that hits hard and fast