Add .

Search your library for a permanent card with mana value X or less, put it onto the battlefield, then shuffle.

Whenever a land enters, this artifact deals 2 damage to that land's controller.

Whenever a land an opponent controls enters, that player loses 2 life and you gain 2 life.

Return target legendary creature card from your graveyard to the battlefield. That creature gains haste. Exile it at the beginning of the next end step.
Splice onto Arcane (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

Creatures you control get +1/+1.
At the beginning of your end step, draw a card.

All Nightmares get +1/+1.
, Pay 3 life: Put target creature card from a graveyard onto the battlefield under your control. That creature is black and is a Nightmare in addition to its other creature types.
When Chainer leaves the battlefield, exile all Nightmares.

Haste (This creature can attack and as soon as it comes under your control.)
When this creature enters, reveal the top four cards of your library. Put all Goblin cards revealed this way into your hand and the rest on the bottom of your library in any order.

This spell costs less to cast, where X is the greatest power among creatures you control.
: Add . You gain 2 life.
Whenever a nontoken creature you control enters, put a +1/+1 counter on it and draw a card.

At the beginning of each end step, put a slime counter on each creature you don't control.
Creatures you don't control get -1/-1 for each slime counter on them.
Whenever a creature you don't control with a slime counter on it dies, create a 1/1 black Slug creature token.
, Sacrifice a Slug: Draw a card.

Horsemanship (This creature can't be blocked except by creatures with horsemanship.)
Whenever Ma Chao attacks alone, it can't be blocked this combat.

If one or more tokens would be created under your control, twice that many of those tokens are created instead.
, Sacrifice two other artifacts and/or creatures: Put an indestructible counter on Mondrak. ( can be paid with either or 2 life.)

Whenever another nontoken artifact you control enters, you may pay . If you do, create a token that's a copy of it. If the token isn't a creature, it becomes a 2/2 Robot Villain creature in addition to its other types.

Mill two cards.
Draw a card.

Whenever a creature deals damage to you, destroy it.

(: Add .)

Vigilance
If a permanent entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Permanents entering don't cause abilities of permanents your opponents control to trigger.

(: Add or .)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

Target spell or permanent becomes black. (Mana symbols on that permanent remain unchanged.)

You may play any number of lands on each of your turns.
Whenever you play a land, if it wasn't the first land you played this turn, this enchantment deals 1 damage to you.