Multiverse Design Challenge: 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.
Apathy
{4}{u}
 
 R 
Creature – Incarnation
As Apathy enters the battlefield, choose an opponent.
Whenever a creature you or the chosen player controls becomes tapped, it doesn't untap during its controller's next untap step.
2/7
Cannon Yard
{3}{r/w}
 
 U 
Terrain
Creatures you control staged at Cannon Yard have first strike.

Creatures you don't control staged at Cannon Yard lose first strike and double strike.
4
Sudden Stoat
{4}{g}
 
 U 
Creature – Beast
Flash
When Sudden Stoat enters the battlefield, prevent all damage that would be dealt to it this turn. Sudden Stoat fights target creature.
2/2
Tempting Fate
{2}{u}
 
 U 
Enchantment
At the beginning of your upkeep, reveal the top card of your library. If it's a land, sacrifice Tempting Fate then return three permanents you control to their owner's hand. Otherwise, draw a card.
Perimeter Watch
{2}{w}
 
 C 
Sorcery
Flashforward {1}{w} (You may cast this spell when you draw it for {1}{w}. If you do, put it in your hand when it resolves.)
Put a 2/2 white soldier token with vigilance onto the battlefield.
Challenge # 116
{u/g}{w/b}{u/r}
 
 C 
Challenge – Alara
Make a common or uncommon Alara mini cycle for Bant or Grixis.
Terra Feeder
{1}{g}
 
 C 
Creature – Beast
Terra Feeder doesn't untap during its controller's untap phase.
Sacrifice a Land: Untap Terra Feeder, it get +1/+1 until end of turn.
2/2
Rubber Band
{1}{r}
 
 C 
Instant
Rubber Band deals 2 damage to target creature or player.
Elastic (You may cast this spell for {1} less or {1} more for a different effect.)
Less: Rubber Band deals 2 damage to target player.
More: Rubber Band deals 3 damage to target creature.
Underwhelm
{u}
 
 C 
Instant
Target creature gains -X/-0 until end of turn, where X is the number of creatures you control.
Outside of movies one man moving against a legion or so of trained soldiers usually fails.
Guardian Spirit
{3}{u}
 
 C 
Creature – Spirit
Flying
Whenever another creature you control dies, you may transform Guardian Spirit.
2/2
Vengeant Spirit
 
 C 
Colour indicator U Creature – Spirit
Hexproof
5/4
Baby Elephant
{w}
 
 C 
Creature – Elephant
You can't cast Baby Elephant unless you control two or more Elephant creatures.
Baby Elephant's power and toughness are each equal to half the number of Elephant creatures you control, rounded down.
*/*
Artic Pup
{1}{g}
 
 C 
Creature – Wolf
Ambush (When this creature attacks and is unblocked, you may tap any number of untapped Wolf creatures you control. Those creatures are now attacking.)
2/2
Toxin Vessel
{4}{b}
 
 C 
Creature – Scorpion
{3}{b}: Replenish. If you do, target opponent loses 1 life, and you gain 1 life. (To replenish, put an exiled card you own on the bottom of your library.)
2/5
Dense Undergrowth
 
 C 
Terrain
Creatures attacking you get -1/-0 and lose First Strike and Double Strike until end of turn.
Its hard enough to find the enemy in here, let alone fight them effectively.
Realm's Edge
 
 B 
Land
{t}: Add {1} to your mana pool.
{w/2}, {t}: Add {w}{w} to your mana pool. ({w/2} can be paid with any two mana or {w}.)
Radiant's Realm hovers between beauty and logic.
Fiend
 T 
Creature – Fiend
Illus. Patrick Ripp
2/2

Apathy (rare)
Cannon Yard (uncommon)
Sudden Stoat (uncommon)
Tempting Fate (uncommon)
Perimeter Watch (common)
Challenge # 116 (common)
Terra Feeder (common)
Rubber Band (common)
Underwhelm (common)
Guardian Spirit (common)
Baby Elephant (common)
Artic Pup (common)
Toxin Vessel (common)
Dense Undergrowth (common)
Realm's Edge (basic)
Fiend (token)