Cortraevas: Perpetuality: Virtual Booster

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This booster was generated with modern collation since the cardset contains mythics: 1 rare / mythic, 3 uncommons, 10 commons, 1 basic land.
You could alternatively have 15 random cards regardless of rarity.
 U 
Artifact Creature – Human Solider
Flash, Repurpose (As you cast this spell, you may remove any number of +1/+1 counters from creatures you control.)

When Aegis Operative enters the battlefield, prevent the next X damage that would be dealt to each creature you control, where X is the number of counters Aegis Operative repurposed.
2/1
 
 R 
Artifact Creature – Serpent
Steel Serpent can't be blocked as long as Steel Serpent has two or more counters on it.

Remove two counters from Steel Serpent: Steel Serpent's controller draws two cards. Any player may activate this ability.
3/3
 U 
Instant
Counter target noncreature spell. If that spell was an instant, instants you cast cost {1} less until end of turn.
 U 
Sorcery
Remove all counters from target creature you don't control. Target creature you control fights that creature.
The Unknown waved their hand and the beings both eerily familiar and distant seemed much less threatening.
 U 
Enchantment – Aura
Enchant creature
Whenever the enchanted creature attacks, the enchanted creature gains your choice of flying, vigilance, or first strike until end of turn.
 C 
Artifact Creature – Human Spider
Construction Sentinel enters the battlefield with a +1/+1 counter.

As long as Construction Sentinel has two or more +1/+1 counters on it, Construction Sentinel has reach.

As long as Construction Sentinel has three or more +1/+1 counters on it, Construction Sentinel has vigilance
0/0
 C 
Land
Garden of Ferocity enters the battlefield tapped.

{t}: Add {r} or {g}.
Tap two nontoken artifacts: Untap Garden of Ferocity. Activate this, only during an opponent's turn, and only once each turn.
 C 
Artifact – Equipment
Equipped creature gets +4/+2.

When equipped creature dies, deal 2 damage to any target

Equip {5}
 C 
Creature – Spirit
Flying

{1}: Saber-Hand Geist gains first strike until end of turn.
Their only memory tethering them to Cortraevas is the blade they knew how to use.
1/1
 C 
Enchantment – Aura
Flash
Enchant creature
Enchanted creature doesn't untap during its controller's untap step unless its controller puts a +1/+1 counter on target creature an opponent controls.
 C 
Artifact
{3},{t}: Tap target creature.

{6},{t}- Sacrifice Explosive Sensor Plate: Explosive Sensor Plate deal 4 damage to target tapped creature.
 C 
Enchantment – Aura
Enchant creature
Enchanted creature gets +1/+4 and can't be blocked by creatures with deathtouch.
Steel or spirit, neither give as easy as flesh.
 C 
Instant
Vitality- If Remove the Unwanted targets a nonartifact creature, that creature's controller loses 1 life.

Destroy target creature.
 C 
Sorcery
As an additional cost to cast Slag Shot, you may sacrifice a nontoken artifact.

Deal 3 damage to target player. If you sacrificed a nontoken artifact, Slag Shot deals 5 damage to that player instead.
Swamp
 
 B 
Basic Land – Swamp

Aegis Operative (uncommon, foil)
Steel Serpent (rare)
Seek Revision (uncommon)
Stripped Brawl (uncommon)
Kiss of Memory (uncommon)
Construction Sentinel (common)
Garden of Ferocity (common)
Destructor Gauntlet (common)
Saber-Hand Geist (common)
Warning Mark (common)
Explosive Sensor Plate (common)
Unliving Endurance (common)
Remove the Unwanted (common)
Slag Shot (common)
Swamp (basic)