Whenever Headless Rider or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token. 3/1
Destroy target nonblack creature. At the beginning of your next upkeep, pay {2}{B}. If you don’t, you lose the game.
As Engineered Plague enters, choose a creature type. All creatures of the chosen type get -1/-1.
Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad, the Grim deals 1 damage to each opponent. {1}{B}: Each player mills a card. (They each put the top card of their library into their graveyard.) 5/4
Flying Whenever you cycle or discard another card, put a -1/-1 counter on each creature your opponents control. Cycling {2} ({2}, Discard this card: Draw a card.) 5/4
At the beginning of your upkeep, sacrifice a permanent. Whenever Greater Harvester deals combat damage to a player, that player sacrifices two permanents.
When Boggart Harbinger comes into play, you may search your library for a Goblin card, reveal it, then shuffle your library and put that card on top of it.
Enchant creature Enchanted creature has deathtouch and indestructible. Morph—Sacrifice another creature. (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) As Gift of Doom is turned face up, you may attach it to a creature.
Each player discards a card, then loses 1 life, then sacrifices an artifact, a creature, an enchantment, a land, a planeswalker, and a tribal permanent, then exiles a card from their graveyard, then puts the top card of their library into their graveyard, then removes a counter from a permanent they control, then gets a poison counter.
At the beginning of your upkeep, the Ring tempts you. Whenever you choose a creature as your Ring-bearer, you may pay 2 life. If you do, draw a card.
Roll two d10 and choose one result. Return a creature card from your graveyard to the battlefield with a number of +1/+1 counters on it equal to that result. Then each opponent loses X life and you gain X life, where X is the other result.
Champion a Goblin (When this comes into play, sacrifice it unless you remove another Goblin you control from the game. When this leaves play, that card returns to play.) Whenever a Goblin you control deals combat damage to a player, you may put a 1/1 black Goblin Rogue creature token into play.
Spree (Choose one or more additional costs.) + 1 — Target opponent sacrifices half the creatures they control, rounded up. + 2 — Target opponent discards half the cards in their hand, rounded up. + 2 — Target opponent loses half their life, rounded up.