Kathari Screecher

Flying
Unearth {2}{U} ({2}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Kederekt Leviathan

When this creature enters, return all other nonland permanents to their owners' hands.
Unearth {6}{U} ({6}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Master of Etherium

Master of Etherium's power and toughness are each equal to the number of artifacts you control.
Other artifact creatures you control get +1/+1.

Bant Battlemage

{G}, {T}: Target creature gains trample until end of turn.
{U}, {T}: Target creature gains flying until end of turn.

Memory Erosion

Whenever an opponent casts a spell, that player mills two cards.

Mindlock Orb

Outrider of Jhess

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Protomatter Powder

{4}{W}, {T}, Sacrifice this artifact: Return target artifact card from your graveyard to the battlefield.

Resounding Wave

Return target permanent to its owner's hand.
Cycling {5}{W}{U}{B} ({5}{W}{U}{B}, Discard this card: Draw a card.)
When you cycle this card, return two target permanents to their owners' hands.

Sharding Sphinx

Thopter

Flying
Whenever an artifact creature you control deals combat damage to a player, you may create a 1/1 blue Thopter artifact creature token with flying.

Skill Borrower

Play with the top card of your library revealed.
As long as the top card of your library is an artifact or creature card, this creature has all activated abilities of that card. (If any of the abilities use that card's name, use this creature's name instead.)

Spell Snip

Counter target spell unless its controller pays {1}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Sphinx Sovereign

Sphinx's Herald

{2}{U}, {T}, Sacrifice a white creature, a blue creature, and a black creature: Search your library for a card named Sphinx Sovereign, put it onto the battlefield, then shuffle.

Steelclad Serpent

This creature can't attack unless you control another artifact.

Battlegrace Angel

Flying
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
Whenever a creature you control attacks alone, it gains lifelink until end of turn.

Tezzeret the Seeker

+1: Untap up to two target artifacts.
−X: Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle.
−5: Artifacts you control become artifact creatures with base power and toughness 5/5 until end of turn.

Shards of Alara