The Brothers' War

Goblin Blast-Runner | Creature | Goblin | Goblin Blast-Runner gets +2/+0 and has menace as long as you sacrificed a permanent this turn. | Joseph Weston

Mishra's Command | Sorcery | | Choose two — • Choose target player. They may discard up to X cards. Then they draw a card for each card discarded this way. • This spell deals X damage to target creature. • This spell deals X damage to target planeswalker. • Target creature gets +X/+0 and gains haste until end of turn. | Dominik Mayer

Monastery Swiftspear | Creature | Human Monk | Haste Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) | Gabor Szikszai

Mishra's Research Desk | Artifact | | {1}, {T}, Sacrifice Mishra's Research Desk: Exile the top two cards of your library. Choose one of them. Until the end of your next turn, you may play that card. Unearth {1}{R} ({1}{R}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.) | Matt Stewart