Myr Landshaper

{T}: Target land becomes an artifact in addition to its other types until end of turn.

Voltaic Key

Mountain

Tin Street Hooligan

When Tin Street Hooligan enters, if {G} was spent to cast it, destroy target artifact.

Ancient Stirrings

Look at the top five cards of your library. You may reveal a colorless card from among them and put it into your hand. Then put the rest on the bottom of your library in any order.

Gorilla Shaman

{X}{X}{1}: Destroy target noncreature artifact with mana value X.

Simian Spirit Guide

Exile Simian Spirit Guide from your hand: Add {R}.

Liquimetal Coating

{T}: Target permanent becomes an artifact in addition to its other types until end of turn.

Forest

Splinter

Exile target artifact. Search its controller's graveyard, hand, and library for all cards with the same name as that artifact and exile them. Then that player shuffles.

Rob the Archives

Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell.)
Exile the top two cards of your library. You may play those cards this turn.