Darksteel

Each creature you control can't be blocked as long as defending player controls an artifact land.

Flash (You may cast this spell any time you could cast an instant.) Reach (This creature can block creatures with flying.)

Karstoderm enters the battlefield with five +1/+1 counters on it. Whenever an artifact enters the battlefield, remove a +1/+1 counter from Karstoderm.

Whenever Fangren Firstborn attacks, put a +1/+1 counter on each attacking creature.

Defender (This creature can't attack.) Protection from artifacts Whenever an opponent casts an artifact spell, you may create a 1/1 green Insect ...

Target creature and all other creatures with the same name as that creature get +2/+2 until end of turn.

Whenever you gain life, put that many +1/+1 counters on Ageless Entity.

{1}{G}, Sacrifice Viridian Zealot: Destroy target artifact or enchantment.

{1}, {T}: Add one mana of any color.

Whenever Tel-Jilad Wolf becomes blocked by an artifact creature, Tel-Jilad Wolf gets +3/+3 until end of turn.

Protection from artifacts

Put two +1/+1 counters on target creature and two +1/+1 counters on another target creature.

Whenever Roaring Slagwurm attacks, tap all artifacts.

Put two target artifacts on top of their owners' libraries.

Choose one — • Destroy target land. • Search your library for a land card, put that card onto the battlefield, then shuffle. Entwine {1}{G} (Choose...

Create a 3/3 green Beast creature token. Then if an opponent controls more creatures than you, return Pulse of the Tangle to its owner's hand.

Destroy target artifact. It can't be regenerated.

You gain 6 life.