Progenitor Mimic

Creature - Shapeshifter

You may have Progenitor Mimic enter the battlefield as a copy of any creature on the battlefield except it gains "At the beginning of your upkeep, if this creature isn't a token, put a token onto the battlefield that's a copy of this creature."

Ruric Thar, the Unbowed

Legendary Creature - Ogre Warrior

Vigilance, reach

Ruric Thar, the Unbowed attacks each turn if able.

Whenever a player casts a noncreature spell, Ruric Thar deals 6 damage to that player.

Scab-Clan Giant

Creature - Giant Warrior

When Scab-Clan Giant enters the battlefield, it fights target creature an opponent controls chosen at random.

For the Gruul, bone-crushing rage is the first priority. Accuracy comes in a distant ninetieth.

Sire of Insanity

Creature - Demon

At the beginning of each end step, each player discards his or her hand.

Its victims become mindless lunatics. Conveniently, that's the first step in joining the Cult of Rakdos.

Call (Beck/Call)

Sorcery

Put four 1/1 white Bird creature tokens with flying onto the battlefield.

Fuse (You may cast one or both halves of this card from your hand.)

Entering (Breaking/Entering)

Sorcery

Put a creature card from a graveyard onto the battlefield under your control. It gains haste until end of turn.

Fuse (You may cast one or both halves of this card from your hand.)

Release (Catch/Release)

Sorcery

Each player sacrifices an artifact, a creature, an enchantment, a land, and a planeswalker.

Fuse (You may cast one or both halves of this card from your hand.)

Boros Battleshaper

Creature - Minotaur Soldier

At the beginning of each combat, up to one target creature attacks or blocks this combat if able and up to one target creature can't attack or block this combat.

Leaders shape the minds of their allies. It takes a master to shape the minds of enemies.

Emmara Tandris

Legendary Creature - Elf Shaman

Prevent all damage that would be dealt to creature tokens you control.

When Selesnya needed a champion, Emmara put the ranks of her guild before herself-making her the perfect choice.

Teysa, Envoy of Ghosts

Legendary Creature - Human Advisor

Vigilance, protection from creatures

Whenever a creature deals combat damage to you, destroy that creature. Put a 1/1 white and black Spirit creature token with flying onto the battlefield.

Trostani's Summoner

Creature - Elf Shaman

When Trostani's Summoner enters the battlefield, put a 2/2 white Knight creature token with vigilance, a 3/3 green Centaur creature token, and a 4/4 green Rhino creature token with trample onto the battlefield.