Opportunist

Fireslinger

Creature — Human Wizard (1/1)

: Fireslinger deals 1 damage to any target and 1 damage to you.

Enraging Licid

Creature — Licid (1/1)

, : Enraging Licid loses this ability and becomes an Aura enchantment with enchant creature. Attach it to target creature. You may pay to end this effect.
Enchanted creature has haste.

Sandstone Warrior

Creature — Human Soldier Warrior (1/3)

First strike (This creature deals combat damage before creatures without first strike.)
: Sandstone Warrior gets +1/+0 until end of turn.

Soltari Guerrillas

Creature — Soltari Soldier (3/2)

Shadow (This creature can block or be blocked by only creatures with shadow.)
: The next time Soltari Guerrillas would deal combat damage to an opponent this turn, it deals that damage to target creature instead.

Shocker

Creature — Insect (1/1)

Whenever Shocker deals damage to a player, that player discards all the cards in their hand, then draws that many cards.

Starke of Rath

Legendary Creature — Human Rogue (2/2)

: Destroy target artifact or creature. That permanent's controller gains control of Starke of Rath. (This effect lasts indefinitely.)

Barbed Sliver

Creature — Sliver (2/2)

All Sliver creatures have ": This creature gets +1/+0 until end of turn."

Canyon Wildcat

Creature — Cat (2/1)

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Heart Sliver

Creature — Sliver (1/1)

All Sliver creatures have haste.

Lightning Elemental

Creature — Elemental (4/1)

Haste (This creature can attack and as soon as it comes under your control.)

Mogg Squad

Creature — Goblin (3/3)

Mogg Squad gets -1/-1 for each other creature on the battlefield.

Rathi Dragon

Creature — Dragon (5/5)

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Rathi Dragon enters the battlefield, sacrifice it unless you sacrifice two Mountains.

Wall of Diffusion

Creature — Wall (0/5)

Defender (This creature can't attack.)
Wall of Diffusion can block creatures with shadow as though Wall of Diffusion had shadow.

Canyon Drake

Creature — Drake (1/2)

Flying
, Discard a card at random: Canyon Drake gets +2/+0 until end of turn.

Chaotic Goo

Creature — Ooze (0/0)

Chaotic Goo enters the battlefield with three +1/+1 counters on it.
At the beginning of your upkeep, you may flip a coin. If you win the flip, put a +1/+1 counter on Chaotic Goo. If you lose the flip, remove a +1/+1 counter from Chaotic Goo.

Firefly

Creature — Insect (1/1)

Flying
: Firefly gets +1/+0 until end of turn.

Flowstone Giant

Creature — Giant (3/3)

: Flowstone Giant gets +2/-2 until end of turn.

Lowland Giant

Creature — Giant (4/3)

Pallimud

Creature — Beast (0/3)

As Pallimud enters the battlefield, choose an opponent.
Pallimud's power is equal to the number of tapped lands the chosen player controls.

Wild Wurm

Creature — Wurm (5/4)

When Wild Wurm enters the battlefield, flip a coin. If you lose the flip, return Wild Wurm to its owner's hand.