Goblin Rabblemaster

Other Goblin creatures you control attack each combat if able.
At the beginning of combat on your turn, create a 1/1 red Goblin creature token with haste.
Whenever Goblin Rabblemaster attacks, it gets +1/+0 until end of turn for each other attacking Goblin.

Leeching Sliver

Whenever a Sliver you control attacks, defending player loses 1 life.

Living Totem

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature’s color.)
When Living Totem enters the battlefield, you may put a +1/+1 counter on another target creature.

Grenzo’s Cutthroat

First strike
Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)

Morkrut Banshee

Morbid — When Morkrut Banshee enters the battlefield, if a creature died this turn, target creature gets -4/-4 until end of turn.

Hydra Omnivore

Whenever Hydra Omnivore deals combat damage to an opponent, it deals that much damage to each other opponent.

Squelching Leeches

Squelching Leeches’s power and toughness are each equal to the number of Swamps you control.

Spawn of Thraxes

Flying
When Spawn of Thraxes enters the battlefield, it deals damage to any target equal to the number of Mountains you control.

Assassin

Whenever this creature deals combat damage to a player, that player loses the game.

Consuming Rage

Whenever a Minotaur attacks this turn, it gets +2/+0 until end of turn. Destroy that creature at end of combat.

Arbiter of the Ideal

Flying
Inspired — Whenever Arbiter of the Ideal becomes untapped, reveal the top card of your library. If it’s an artifact, creature, or land card, you may put it onto the battlefield with a manifestation counter on it. That permanent is an enchantment in addition to its other types.

Fated Intervention

Create two 3/3 green Centaur enchantment creature tokens. If it’s your turn, 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.)

Temple of Enlightenment

Temple of Enlightenment enters the battlefield tapped.
When Temple of Enlightenment enters the battlefield, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
: Add or .

Mortal’s Resolve

Target creature gets +1/+1 and gains indestructible until end of turn. (Damage and effects that say “destroy” don’t destroy it.)

Toxic Deluge

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

Simic Guildgate

Simic Guildgate enters the battlefield tapped.
: Add or .

Furnace Celebration

Whenever you sacrifice another permanent, you may pay . If you do, Furnace Celebration deals 2 damage to any target.