Boompile

{T}: Flip a coin. If you win the flip, destroy all nonland permanents.

Eager Construct

When this creature enters, each player may scry 1. (To scry 1, look at the top card of your library, then you may put that card on the bottom.)

Kamahl's Summons

Each player may reveal any number of creature cards from their hand. Then each player creates a 2/2 green Bear creature token for each card they revealed this way.

Collective Voyage

Join forces — Starting with you, each player may pay any amount of mana. Each player searches their library for up to X basic land cards, where X is the total amount of mana paid this way, puts them onto the battlefield tapped, then shuffles.

Kindred Dominance

Choose a creature type. Destroy all creatures that aren't of the chosen type.

Grismold, the Dreadsower

Trample
At the beginning of your end step, each player creates a 1/1 green Plant creature token.
Whenever a creature token dies, put a +1/+1 counter on Grismold.

Tombstone Stairwell

Cumulative upkeep {1}{B} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
At the beginning of each upkeep, if this enchantment is on the battlefield, each player creates a 2/2 black Zombie creature token with haste named Tombspawn for each creature card in their graveyard.
At the beginning of each end step and when this enchantment leaves the battlefield, destroy all tokens created with this enchantment. They can't be regenerated.

Damnation

Destroy all creatures. They can't be regenerated.

Waiting in the Weeds

Each player creates a 1/1 green Cat creature token for each untapped Forest they control.

Decree of Pain

Destroy all creatures. They can't be regenerated. Draw a card for each creature destroyed this way.
Cycling {3}{B}{B} ({3}{B}{B}, Discard this card: Draw a card.)
When you cycle this card, all creatures get -2/-2 until end of turn.

Elephant Resurgence

Each player creates a green Elephant creature token. Those creatures have "This token's power and toughness are each equal to the number of creature cards in its controller's graveyard."

Extinction

Destroy all creatures of the creature type of your choice.

Crux of Fate

Choose one —
• Destroy all Dragon creatures.
• Destroy all non-Dragon creatures.

Plague Boiler

At the beginning of your upkeep, put a plague counter on this artifact.
{1}{B}{G}: Put a plague counter on this artifact or remove a plague counter from it.
When this artifact has three or more plague counters on it, sacrifice it. If you do, destroy all nonland permanents.

Nevinyrral's Disk

This artifact enters tapped.
{1}, {T}: Destroy all artifacts, creatures, and enchantments.

Plague Wind

Destroy all creatures you don't control. They can't be regenerated.

Liege of the Hollows

When this creature dies, each player may pay any amount of mana. Then each player creates a number of 1/1 green Squirrel creature tokens equal to the amount of mana they paid this way.

The Great Aurora

Each player shuffles all cards from their hand and all permanents they own into their library, then draws that many cards. Each player may put any number of land cards from their hand onto the battlefield. Exile The Great Aurora.

Do or Die

Separate all creatures target player controls into two piles. Destroy all creatures in the pile of that player's choice. They can't be regenerated.

Ritual of Soot

Destroy all creatures with mana value 3 or less.

Rites of Flourishing

At the beginning of each player's draw step, that player draws an additional card.
Each player may play an additional land on each of their turns.

Plague of Vermin

Starting with you, each player may pay any amount of life. Repeat this process until no one pays life. Each player creates a 1/1 black Rat creature token for each 1 life they paid this way.