: Add .
, : Target creature gains double strike until end of turn.

, : Add for each Swamp you control.

(: Add .)
Leechridden Swamp enters tapped.
, : Each opponent loses 1 life. Activate only if you control two or more black permanents.

Shivan Oasis enters tapped.
: Add or .

When Flamekin Harbinger enters, you may search your library for an Elemental card, reveal it, then shuffle and put that card on top.

Blaze deals X damage to any target.

Assault deals 2 damage to any target.

Double strike

Savage Twister deals X damage to each creature.

The next X damage that would be dealt to target creature, planeswalker, or player this turn is dealt to another target creature, planeswalker, or player instead.

: Exile target card from a graveyard.

Spend only black mana on X.
Consume Spirit deals X damage to any target and you gain X life.

Whenever equipped creature deals combat damage to a player, you may draw two cards. If you do, discard a card.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

: Target creature gains haste until end of turn.
: Target creature gains first strike until end of turn.

Lightning Helix deals 3 damage to any target and you gain 3 life.

Whenever Arcbound Slith deals combat damage to a player, put a +1/+1 counter on it.
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Whenever Serum Tank or another artifact enters, put a charge counter on Serum Tank.
, , Remove a charge counter from Serum Tank: Draw a card.

Creatures you control have haste.
Sacrifice Fires of Yavimaya: Target creature gets +2/+2 until end of turn.

Whenever equipped creature attacks, it deals damage equal to its power to the player or planeswalker it's attacking.
Equip

Search your library for an artifact card, reveal it, put it into your hand, then shuffle.

Exile target attacking creature.

Double strike

When Duergar Hedge-Mage enters, if you control two or more Mountains, you may destroy target artifact.
When Duergar Hedge-Mage enters, if you control two or more Plains, you may destroy target enchantment.

Create X 1/1 red Goblin creature tokens.

Draw three cards. Then discard two cards unless you discard an artifact card.

, : Create a 0/1 colorless Pest artifact creature token.

Any player may have Browbeat deal 5 damage to them. If no one does, target player draws three cards.

, or , : Return target artifact creature card from your graveyard to your hand.

Enchant creature
Enchanted creature can't attack or block, and its activated abilities can't be activated.
Whenever a creature an opponent controls enters, you may attach Prison Term to that creature.

Creatures of the creature type of your choice get +X/+X until end of turn.

First strike
Whenever another creature dies, you may put a +1/+1 counter on Rockslide Elemental.

Zombie spells you cast cost less to cast.
Zombie creatures you control get +2/+1.

Trample
Whenever another artifact enters, put a +1/+1 counter on Arcbound Crusher.
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

Flash
When Briarhorn enters, target creature gets +3/+3 until end of turn.
Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Soulless One's power and toughness are each equal to the number of Zombies on the battlefield plus the number of Zombie cards in all graveyards.