Archon of the Triumvirate

Flying
Whenever Archon of the Triumvirate attacks, detain up to two target nonland permanents your opponents control. (Until your next turn, those permanents can’t attack or block and their activated abilities can’t be activated.)

Vow of Lightning

Enchant creature
Enchanted creature gets +2/+2, has first strike, and can’t attack you or a planeswalker you control.

The Mimeoplasm

As The Mimeoplasm enters the battlefield, you may exile two creature cards from graveyards. If you do, it enters the battlefield as a copy of one of those cards with a number of additional +1/+1 counters on it equal to the power of the other card.

Rite of the Raging Storm

Creatures named Lightning Rager can’t attack you or planeswalkers you control.
At the beginning of each player’s upkeep, that player creates a 5/1 red Elemental creature token named Lightning Rager. It has trample, haste, and “At the beginning of the end step, sacrifice this creature.”

Toxic Deluge

As an additional cost to cast this spell, pay X life.
All creatures get -X/-X until end of turn.

Ezuri’s Predation

For each creature your opponents control, create a 4/4 green Beast creature token. Each of those Beasts fights a different one of those creatures.

Talrand, Sky Summoner

Whenever you cast an instant or sorcery spell, create a 2/2 blue Drake creature token with flying.

Preordain

Scry 2, then draw a card. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Rite of the Raging Storm

Creatures named Lightning Rager can’t attack you or planeswalkers you control.
At the beginning of each player’s upkeep, that player creates a 5/1 red Elemental creature token named Lightning Rager. It has trample, haste, and “At the beginning of the end step, sacrifice this creature.”

Ezuri’s Predation

For each creature your opponents control, create a 4/4 green Beast creature token. Each of those Beasts fights a different one of those creatures.

Lightning Rager

Trample, haste
At the beginning of the end step, sacrifice this creature.

Simic Guildgate

Simic Guildgate enters the battlefield tapped.
: Add or .

Swarm Surge

Devoid (This card has no color.)
Creatures you control get +2/+0 until end of turn. Colorless creatures you control also gain first strike until end of turn.

Ulamog’s Reclaimer

Devoid (This card has no color.)
When Ulamog’s Reclaimer enters the battlefield, you may put a card an opponent owns from exile into that player’s graveyard. If you do, return target instant or sorcery card from your graveyard to your hand.

Windrider Patrol

Flying
Whenever Windrider Patrol deals combat damage to a player, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Cryptic Cruiser

Devoid (This card has no color.)
, Put a card an opponent owns from exile into that player’s graveyard: Tap target creature.

Graypelt Hunter

Trample
Whenever Graypelt Hunter or another Ally enters the battlefield under your control, you may put a +1/+1 counter on Graypelt Hunter.