Manglehorn

When Manglehorn enters the battlefield, you may destroy target artifact.
Artifacts your opponents control enter the battlefield tapped.

Forest

Llanowar Elves

Harmonize

Indrik Stomphowler

When Indrik Stomphowler enters the battlefield, destroy target artifact or enchantment.

Wickerbough Elder

Wickerbough Elder enters the battlefield with a -1/-1 counter on it.
{G}, Remove a -1/-1 counter from Wickerbough Elder: Destroy target artifact or enchantment.

Conclave Naturalists

When Conclave Naturalists enters the battlefield, you may destroy target artifact or enchantment.

Liquimetal Coating

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

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.

Nature's Claim

Destroy target artifact or enchantment. Its controller gains 4 life.

Elvish Mystic

Field of Ruin

{T}: Add {C}.
{2}, {T}, Sacrifice Field of Ruin: Destroy target nonbasic land an opponent controls. Each player searches their library for a basic land card, puts it onto the battlefield, then shuffles.

Reclamation Sage

When Reclamation Sage enters the battlefield, you may destroy target artifact or enchantment.

Viridian Shaman

When Viridian Shaman enters the battlefield, destroy target artifact.

Liquimetal Torque

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