Liquimetal Coating

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

Eradicate

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

Cast Down

Contaminated Ground

Enchant land
Enchanted land is a Swamp.
Whenever enchanted land becomes tapped, its controller loses 2 life.

Putrefy

Destroy target artifact or creature. It can't be regenerated.

Forest

Llanowar Elves

Myr Landshaper

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

Thornweald Archer

Reach (This creature can block creatures with flying.)
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Swamp

Spore Frog

Sacrifice this creature: Prevent all combat damage that would be dealt this turn.

Corrupted Roots

Enchant Forest or Plains
Whenever enchanted land becomes tapped, its controller loses 2 life.

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.

Rampant Growth

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Helldozer

{B}{B}{B}, {T}: Destroy target land. If that land was nonbasic, untap this creature.

Explore

You may play an additional land this turn.
Draw a card.

Lifespark Spellbomb

{G}, Sacrifice this artifact: Until end of turn, target land becomes a 3/3 creature that's still a land.
{1}, Sacrifice this artifact: Draw a card.