Clockwork Hydra

Triskelavus

Artifact Creature — Construct (1/1)

Flying
Triskelavus enters the battlefield with three +1/+1 counters on it.
, Remove a +1/+1 counter from Triskelavus: Create a 1/1 colorless Triskelavite artifact creature token with flying. It has "Sacrifice this creature: This creature deals 1 damage to any target."

Phantom Wurm

Creature — Wurm Spirit (2/0)

Phantom Wurm enters the battlefield with four +1/+1 counters on it.
If damage would be dealt to Phantom Wurm, prevent that damage. Remove a +1/+1 counter from Phantom Wurm.

Spike Tiller

Creature — Spike (0/0)

Spike Tiller enters the battlefield with three +1/+1 counters on it.
, Remove a +1/+1 counter from Spike Tiller: Put a +1/+1 counter on target creature.
, Remove a +1/+1 counter from Spike Tiller: Target land becomes a 2/2 creature that's still a land. Put a +1/+1 counter on it.

Stuffy Doll

Artifact Creature — Construct (0/1)

Indestructible
As Stuffy Doll enters the battlefield, choose a player.
Whenever Stuffy Doll is dealt damage, it deals that much damage to the chosen player.
: Stuffy Doll deals 1 damage to itself.

Fledgling Mawcor

Creature — Beast (2/2)

Flying
: Fledgling Mawcor deals 1 damage to any target.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Psionic Sliver

Creature — Sliver (2/2)

All Sliver creatures have ": This creature deals 2 damage to any target and 3 damage to itself."

Riftwing Cloudskate

Creature — Illusion (2/2)

Flying
When Riftwing Cloudskate enters the battlefield, return target permanent to its owner's hand.
Suspend 3— (Rather than cast this card from your hand, you may pay and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost. It has haste.)

Fungus Sliver

Creature — Fungus Sliver (2/2)

All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it." (It must survive the damage to get the counter.)

Venser's Sliver

Artifact Creature — Sliver (3/3)

Jhoira's Timebug

Artifact Creature — Insect (1/2)

: Choose target permanent you control or suspended card you own. If that permanent or card has a time counter on it, you may remove a time counter from it or put another time counter on it.

Gauntlet of Power

Artifact

As Gauntlet of Power enters the battlefield, choose a color.
Creatures of the chosen color get +1/+1.
Whenever a basic land is tapped for mana of the chosen color, its controller adds an additional one mana of that color.

Paradise Plume

Artifact

As Paradise Plume enters the battlefield, choose a color.
Whenever a player casts a spell of the chosen color, you may gain 1 life.
: Add one mana of the chosen color.

Vampiric Sliver

Creature — Sliver (3/3)

All Sliver creatures have "Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature."

Firemaw Kavu

Creature — Kavu (4/2)

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When Firemaw Kavu enters the battlefield, it deals 2 damage to target creature.
When Firemaw Kavu leaves the battlefield, it deals 4 damage to target creature.

Draining Whelk

Creature — Illusion (1/1)

Flash
Flying
When Draining Whelk enters the battlefield, counter target spell. Put X +1/+1 counters on Draining Whelk, where X is that spell's mana value.

Gustcloak Cavalier

Creature — Human Knight (2/2)

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
Whenever Gustcloak Cavalier attacks, you may tap target creature.
Whenever Gustcloak Cavalier becomes blocked, you may untap Gustcloak Cavalier and remove it from combat.

Keldon Halberdier

Creature — Human Warrior (4/1)

First strike
Suspend 4— (Rather than cast this card from your hand, you may pay and exile it with four time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost. It has haste.)

Nightshade Assassin

Creature — Human Assassin (2/1)

First strike
When Nightshade Assassin enters the battlefield, you may reveal X black cards in your hand. If you do, target creature gets -X/-X until end of turn.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Pentarch Paladin

Creature — Human Knight (3/3)

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
As Pentarch Paladin enters the battlefield, choose a color.
, : Destroy target permanent of the chosen color.

Vesuvan Shapeshifter

Creature — Shapeshifter (0/0)

As Vesuvan Shapeshifter enters the battlefield or is turned face up, you may choose another creature on the battlefield. If you do, until Vesuvan Shapeshifter is turned face down, it becomes a copy of that creature, except it has "At the beginning of your upkeep, you may turn this creature face down."
Morph