Watchdog

Artifact Creature — Dog (1/2)

Watchdog blocks each combat if able.
As long as Watchdog is untapped, all creatures attacking you get -1/-0.

Weathered Sentinels

Artifact Creature — Wall (2/5)

Defender, vigilance, reach, trample
Weathered Sentinels can attack players who attacked you during their last turn as though it didn't have defender.
Whenever Weathered Sentinels attacks, it gets +3/+3 and gains indestructible until end of turn.

Wickerwing Effigy

Artifact Creature — Scarecrow (1/4)

Defender
You may look at the top card of your library any time.
You may cast creature spells from the top of your library.
Whenever you cast a creature spell from your library, it becomes a black Bird in addition to its other colors and types, has flying, and has base power and toughness 1/1.

Wild-Field Scarecrow

Artifact Creature — Scarecrow (1/4)

Defender
, Sacrifice Wild-Field Scarecrow: Search your library for up to two basic land cards, reveal them, put them into your hand, then shuffle.

Wingrattle Scarecrow

Artifact Creature — Scarecrow (2/2)

Wingrattle Scarecrow has flying as long as you control a blue creature.
Wingrattle Scarecrow has persist as long as you control a black creature. (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Wirecat

Artifact Creature — Cat (4/3)

Wirecat can't attack or block if an enchantment is on the battlefield.

Academy Manufactor

Artifact Creature — Assembly-Worker (1/3)

If you would create a Clue, Food, or Treasure token, instead create one of each.

Aegis Automaton

Artifact Creature — Construct (0/3)

: Return another target creature you control to its owner's hand.

Aesthir Glider

Artifact Creature — Bird Construct (2/1)

Flying
Aesthir Glider can't block.

Agent of Acquisitions

Artifact Creature — Construct (2/1)

Draft Agent of Acquisitions face up.
Instead of drafting a card from a booster pack, you may draft each card in that booster pack, one at a time. If you do, turn Agent of Acquisitions face down and you can't draft cards for the rest of this draft round. (You may look at booster packs passed to you.)

Alloy Myr

Artifact Creature — Myr (2/2)

: Add one mana of any color.

Alpha Myr

Artifact Creature — Myr (2/1)

Anvilwrought Raptor

Artifact Creature — Bird (2/1)

Flying
First strike (This creature deals combat damage before creatures without first strike.)

Armored Transport

Artifact Creature — Construct (2/1)

Prevent all combat damage that would be dealt to Armored Transport by creatures blocking it.

Assembly-Worker

Artifact Creature — Assembly-Worker (2/2)

: Target Assembly-Worker creature gets +1/+1 until end of turn.

Auriok Replica

Artifact Creature — Cleric (2/2)

, Sacrifice Auriok Replica: Prevent all damage a source of your choice would deal to you this turn.

Automated Artificer

Artifact Creature — Artificer (1/3)

: Add . Spend this mana only to activate an ability or cast an artifact spell.

Awakened Amalgam

Artifact Creature — Golem (0/0)

Awakened Amalgam's power and toughness are each equal to the number of differently named lands you control.

Battering Ram

Artifact Creature — Construct (1/1)

At the beginning of combat on your turn, Battering Ram gains banding until end of combat. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's blocking.)
Whenever Battering Ram becomes blocked by a Wall, destroy that Wall at end of combat.

Bladed Sentinel

Artifact Creature — Construct (2/4)

: Bladed Sentinel gains vigilance until end of turn.