War of the Spark

Commence the Endgame | Instant | | This spell can't be countered. Draw two cards, then amass X, where X is the number of cards in your hand. (Put X +1/+1 counters on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.) | Noah Bradley

Bolas's Citadel | Legendary Artifact | | You may look at the top card of your library any time. You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost. {T}, Sacrifice ten nonland permanents: Each opponent loses 10 life. | Jonas De Ro

Command the Dreadhorde | Sorcery | | Choose any number of target creature and/or planeswalker cards in graveyards. Command the Dreadhorde deals damage to you equal to the total mana value of those cards. Put them onto the battlefield under your control. | Daarken

Casualties of War | Sorcery | | Choose one or more — • Destroy target artifact. • Destroy target creature. • Destroy target enchantment. • Destroy target land. • Destroy target planeswalker. | Tomasz Jedruszek

Ugin, the Ineffable | Legendary Planeswalker | Ugin | Colorless spells you cast cost {2} less to cast. +1: Exile the top card of your library face down and look at it. Create a 2/2 colorless Spirit creature token. When that token leaves the battlefield, put the exiled card into your hand. −3: Destroy target permanent that's one or more colors. | Daarken