Jurijus Chitrovas

The unassuming exterior was the perfect cover for the Brotherhood's operations.

Assassin Den

Defender (This creature can't attack.)
{3}{U}: Put a +1/+1 counter on target creature you control. It can't be blocked this turn. Activate only as a sorcery.

Resistance Is Futile

Choose one —
• Destroy target nonartifact creature.
• Return target artifact creature card with mana value 3 or less from your graveyard to the battlefield.

Sela, Tal Shiar Paradox

Whenever Sela attacks, exile up to one target card from a graveyard.
Whenever one or more cards leave your graveyard, create a tapped 2/2 black Romulan creature token.

Captain Kathryn Janeway

You may play an additional land on each of your turns.
Whenever Captain Janeway or another creature you control enters, that creature explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on the creature, then put the card back or put it into your graveyard.)

Gardenize

Whenever a creature you control dies, put a charge counter on this enchantment.
At the beginning of your first main phase, add {G} for each charge counter on this enchantment.

"Clothes that won't burn off? Finally!"
—Human Torch, Johnny Storm

Unstable Molecule Suit

Equipped creature gets +2/+2 and has indestructible.
Equip commander {2}
Equip {4}

Super Villain Lockup

Flash
When this enchantment enters, exile target tapped creature an opponent controls until this enchantment leaves the battlefield.

Plains

Nighthawk, Dark Defender

Flying
Whenever Nighthawk or another Hero you control enters, target creature gets +1/+1 until end of turn.

"I've seen the fighting techniques of some of the best. Now their strengths are mine."

Echo, Perceptive Prodigy

Vigilance
{1}, {T}: Copy target activated or triggered ability you control from a creature source. You may choose new targets for the copy. (Mana abilities can't be targeted.)

Donald Blake, Guise of Thor

Lifelink
Power-up — {4}{W}{W}: Put two +1/+1 counters and a flying counter on Donald Blake. He becomes a God Warrior Hero. (He loses all other creature types. Activate each power-up ability only once. Reduce the cost by his mana cost if he entered this turn.)

"This sword is my heritage. I respect it by having the skill to wield it."

Colleen Wing, Street Samurai

Whenever you cast a spell that targets a creature you control, put a +1/+1 counter on Colleen Wing. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Collective Effort

Escalate—Tap an untapped creature you control. (Pay this cost for each mode chosen beyond the first.)
Choose one or more —
• Destroy target creature with power 4 or greater.
• Destroy target enchantment.
• Put a +1/+1 counter on each creature target player controls.

Clever Concealment

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Any number of target nonland permanents you control phase out. (Treat them and anything attached to them as though they don't exist until your next turn.)

"Bank robbery? In Harlem? On a Sunday? You must be outta your mind."

Big Score

As an additional cost to cast this spell, discard a card.
Draw two cards and create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")

Sidequest: Card Collection // Magicked Card

When this enchantment enters, draw three cards, then discard two cards.
At the beginning of your end step, if eight or more cards are in your graveyard, transform this enchantment.

"Strange as it may seem, the longer I linger here, the less the matter of my epitaph concerns me."

Lingering Souls

Create two 1/1 white Spirit creature tokens with flying.
Flashback {1}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

"We need to stop Starrick and return London to the people who built it in the first place."
—Jayadeep Mir

Brotherhood Spy

At the beginning of combat on your turn, if you control a legendary Assassin, this creature gets +1/+0 until end of turn and can't be blocked this turn.