As an additional cost to cast this spell, discard X cards.
Look at target opponent's hand and choose X cards from it. That player discards those cards.
{4}
Aligned Hedron Network
Artifact
When Aligned Hedron Network enters the battlefield, exile all creatures with power 5 or greater until Aligned Hedron Network leaves the battlefield. (Those creatures return under their owners' control.)
--
Ally Encampment
Land
{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast an Ally spell.
{1}, {T}, Sacrifice Ally Encampment: Return target Ally you control to its owner's hand.
{3}
Arcane Encyclopedia
Artifact
{3}, {T}: Draw a card.
{6}{G}
Battering Wurm
Creature - Wurm
Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters the battlefield with a +1/+1 counter on it.)
Creatures with power less than Battering Wurm's power can't block it.
4 /
3
{1}{B}
Battle-Rage Blessing
Instant
Target creature gains deathtouch and indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)
{B}
Battlefly Swarm
Creature - Phyrexian Insect
Flying
{B}: Battlefly Swarm gains deathtouch until end of turn.
1 /
1
{G}
Battlegrowth
Instant
Put a +1/+1 counter on target creature.
{1}{W/B}
Batwing Brume
Instant
Prevent all combat damage that would be dealt this turn if {W} was spent to cast this spell. Each player loses 1 life for each attacking creature they control if {B} was spent to cast this spell. (Do both if {W}{B} was spent.)
{1}{G}
Bayou Dragonfly
Creature - Insect
Flying; swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
1 /
1
{2}{G}
Blex, Vexing Pest
Legendary Creature - Pest
Other Pests, Bats, Insects, Snakes, and Spiders you control get +1/+1.
When Blex, Vexing Pest dies, you gain 4 life.
3 /
2
--
Search for Blex
Sorcery
Look at the top five cards of your library. You may put any number of them into your hand and the rest into your graveyard. You lose 3 life for each card you put into your hand this way.
3 /
2
{2}{B}
Blight Mound
Enchantment
Attacking Pests you control get +1/+0 and have menace.
Whenever a nontoken creature you control dies, create a 1/1 black and green Pest creature token with "When this creature dies, you gain 1 life."
{3}
Coiled Tinviper
Artifact Creature - Snake
First strike
2 /
1
{4}{B}{B}
Deadly Tempest
Sorcery
Destroy all creatures. Each player loses life equal to the number of creatures they controlled that were destroyed this way.
{4}{G}
Dirtcowl Wurm
Creature - Wurm
Whenever an opponent plays a land, put a +1/+1 counter on Dirtcowl Wurm.
3 /
4
{1}{G}
Earthcraft
Enchantment
Tap an untapped creature you control: Untap target basic land.
{G}
Frog Tongue
Enchantment - Aura
Enchant creature
When Frog Tongue enters the battlefield, draw a card.
Enchanted creature has reach. (It can block creatures with flying.)
{1}{B}
Hunt for Specimens
Sorcery
Create a 1/1 black and green Pest creature token with "When this creature dies, you gain 1 life."
Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)
{3}
Nuisance Engine
Artifact
{2}, {T}: Create a 0/1 colorless Pest artifact creature token.
{X}{X}{G}
Pest Infestation
Sorcery
Destroy up to X target artifacts and/or enchantments. Create twice X 1/1 black and green Pest creature tokens with "When this creature dies, you gain 1 life."
{1}{B/G}{B/G}
Pest Summoning
Sorcery - Lesson
Create two 1/1 black and green Pest creature tokens with "When this creature dies, you gain 1 life."
{2}{B}
Pestilence Rats
Creature - Rat
Pestilence Rats's power is equal to the number of other Rats on the battlefield. (For example, as long as there are two other Rats on the battlefield, Pestilence Rats's power and toughness are 2/3.)
* /
3
{2}{B}
Pestilent Cauldron
Artifact
{T}, Discard a card: Create a 1/1 black and green Pest creature token with "When this creature dies, you gain 1 life."
{1}, {T}: Each opponent mills cards equal to the amount of life you gained this turn.
{4}, {T}: Exile four target cards from a single graveyard. Draw a card.
--
Restorative Burst
Sorcery
Return up to two target creature, land, and/or planeswalker cards from your graveyard to your hand. Each player gains 4 life. Exile Restorative Burst.
{1}
Signal Pest
Artifact Creature - Pest
Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)
Signal Pest can't be blocked except by creatures with flying or reach.
0 /
1
{G}
Spike Drone
Creature - Spike Drone
Spike Drone enters the battlefield with a +1/+1 counter on it.
{2}, Remove a +1/+1 counter from Spike Drone: Put a +1/+1 counter on target creature.