Infinite Potential Well: 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, 1 token.
You could alternatively have 15 random cards regardless of rarity.
 R 
Creature – Ooze
Engulfing Slime enters with X +1/+1 counters on it.
Whenever a creature dealt damage by Engulfing Slime this turn dies, put a number of +1/+1 counters on Engulfing Slime equal to that creature's mana value.
Om nom nom everything.
1/1
 U 
Artifact Enchantment Creature – Ooze
Bestow {c}{c}
Enchanted noncreature artifact is a 2/2 creature in addition to its other types.
2/2
 U 
Enchantment
Whenever a xeno creature enters under you control, look at the top X cards of your library, where X is its mana value. You may reveal a land card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. (Aliens, Daleks, Necrons, Time Lords, and Tyranids are xeno.)
 U 
Creature – Siren
Siren of Nerono enters with an underworld counter on it.
Whenever Siren of Nerono or another creature you control dies, scry 2.
At the beginning of your upkeep, shuffle your library.
The sirens torment lost souls by whispering true directions – words that fade immediately from the listener's mind.
1/2
 C 
Creature – Human Soldier
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
Direkon sends his infantry in first to surround the enemy, in order to block off all means of escape.
1/1
 C 
Sorcery
Each player may pay 2 life. Each player who does draws two cards.
Everything can be bought ... for a price.
 C 
Instant
Counter target spell if it's not the first spell cast this turn.
 C 
Artifact Creature – Scarecrow
As Shimmering Scarecrow enters, choose a color.
Shimmering Scarecrow is the last color you’ve chosen this game.
{t}: Add one mana of the last color you’ve chosen this game.
{1}: Choose a color.
2/2
 C 
Creature – Starfish
Slain — When Iridescent Starfish dies, scry X, where X is the amount of damage marked on it.
Images formed on its rippling underside, showing her visions of things she could not otherwise know.
1/3
 C 
Enchantment – Aura
Enchant creature
Enchanted creature gets +1/+1 and has deathtouch and "When this creature deals combat damage to a player, blight a land they control. (Put a blight counter on it.)"
 C 
Creature – Incarnation
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
1/1
 C 
Instant
Destroy target creature. Blight a land its controller's controls. (Put a blight counter on it.)
The bodies of the damned desecrate the very land into which they are interred.
 C 
Creature – Minotaur Berserker
[Paralyze]
Krubrec's hunters roam the cliffs and valleys, attacking travelers both friend and foe in their frenzy.
1/1
 C 
Enchantment – Aura
Enchant creature
Enchanted creature gets +2/+2 for each creature you control.
 B 
Planet – Earth
All creatures get +1/+1 and have "When this creature dies, you may pay {1}. If you do, shuffle it into your library."
3
 T 
Token Artifact – Equipment Ring
Equipped creature has shadow.
Equip {3}

Engulfing Slime (rare)
Animating Slime (uncommon)
Crop Circle (uncommon)
Siren of Nerono (uncommon)
Foot-Soldier of Direkon (common)
Shady Dealings (common)
Punish Greed (common)
Shimmering Scarecrow (common)
Iridescent Starfish (common)
Grasp of Poison (common)
Persistence (common)
Salt the Earth (common)
Hunter of Krubrec (common)
Wolf Totem (common)
Earth, Center of Exploration (basic)
Ring of Power (token)