Scourge of the Undercity

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

When this creature enters, target creature you control gains deathtouch and lifelink until end of turn.

Menace

When this creature enters, target Vampire you control gets +1/+1 and gains menace until end of turn.

Whenever another black creature you control enters, target creature gains intimidate until end of turn. (It can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Flying, lifelink

Disguise (You may cast this card face down for as a 2/2 creature with ward . Turn it face up any time for its disguise cost.)

When this creature is turned face up, another target creature you control gains lifelink until end of turn.

Flash

When this creature enters, target Knight gains deathtouch and lifelink until end of turn.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Whenever this creature attacks, another target Assassin you control gains deathtouch until end of turn.