Thalia's Lieutenant

When this creature enters, put a +1/+1 counter on each other Human you control.
Whenever another Human you control enters, put a +1/+1 counter on this creature.

Clue

Thraben Inspector

When this creature enters, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")

Topplegeist

Flying
When this creature enters, tap target creature an opponent controls.
Delirium — At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, tap target creature that player controls.

Town Gossipmonger // Incited Rabble

Shadows Over Innistrad Checklist 1

Town Gossipmonger

{T}, Tap an untapped creature you control: Transform this creature.

Rumors are sparks: gather enough of them and something's going to catch fire.

Incited Rabble

This creature attacks each combat if able.
{2}: This creature gets +1/+0 until end of turn.

Unruly Mob

Whenever another creature you control dies, put a +1/+1 counter on this creature.

Vessel of Ephemera

Spirit

{2}{W}, Sacrifice this enchantment: Create two 1/1 white Spirit creature tokens with flying.

Aberrant Researcher // Perfected Form

"Metamorphosis is a process."
—Laboratory notes

Aberrant Researcher

Flying
At the beginning of your upkeep, mill a card. If an instant or sorcery card was milled this way, transform this creature. (To mill a card, put the top card of your library into your graveyard.)

The final pages of the experiment log were blank. Investigators found it abandoned on a desk in the researcher's lab, open, the pages flipping in the wind from a shattered window.

Perfected Form

Archangel Avacyn // Avacyn, the Purifier

Shadows Over Innistrad Checklist 2

Archangel Avacyn

Flash
Flying, vigilance
When Archangel Avacyn enters, creatures you control gain indestructible until end of turn.
When a non-Angel creature you control dies, transform Archangel Avacyn at the beginning of the next upkeep.

"Wings that once bore hope are now stained with blood. She is our guardian no longer."
—Grete, cathar apostate

Avacyn, the Purifier

Flying
When this creature transforms into Avacyn, the Purifier, it deals 3 damage to each other creature and each opponent.

Broken Concentration

Counter target spell.
Madness {3}{U} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Catalog

Compelling Deterrence

Return target nonland permanent to its owner's hand. Then that player discards a card if you control a Zombie.

Confirm Suspicions

Counter target spell.
Investigate three times. (To investigate, create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")

Daring Sleuth // Bearer of Overwhelming Truths

"No matter the cost, I must discover the source of these strange happenings."

Daring Sleuth

When you sacrifice a Clue, transform this creature.

Bearer of Overwhelming Truths

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever this creature deals combat damage to a player, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")

Deny Existence

Counter target creature spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Drownyard Explorers

Drunau Corpse Trawler

Zombie

When this creature enters, create a 2/2 black Zombie creature token.
{2}{B}: Target Zombie gains deathtouch until end of turn.

Shadows over Innistrad