Secret Lair Drop

Creature — Elephant Soldier

Artifacts, creatures, and lands your opponents control enter tapped.

Loxodon Gatekeeper

Creature — Human Ninja

Ninjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
You may have this creature enter as a copy of any creature on the battlefield, except it's a Ninja in addition to its other creature types.

Sakashima's Student

Creature — Rat Ninja

Ninjutsu {2}{B} ({2}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever this creature deals combat damage to a player, destroy target nonblack creature that player controls.

Throat Slitter

Creature — Goblin Shaman

Whenever you cast an instant or sorcery spell, this creature deals 2 damage to each opponent.

Guttersnipe

Creature — Vampire Warrior

Flying
Whenever this creature or another creature you control dies, each opponent sacrifices a creature of their choice.