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.
Insanity Specter
{1}{b}{b}
 
 R 
Creature – Specter
Flying
Whenever Insanity Specter deals combat damage to a player, that player reveals their hand and discards all nonland cards with the same name as another card in their hand.
2/3
Goblin Flamechanter
{r}{r}
 
 U 
Creature – Goblin Shaman
Whenever you cast an instant goblins you control get +1/+0 until end of turn.
1/1
Elitist Charm
({w/b})
 
 U 
Instant
Choose one — Target creature gains lifelink until end of turn; or exile target card in a graveyard; or destroy target attacking creature with toughness 2 or less.
Protea Ultimus
{3}
 
 U 
Artifact Creature – Changeling
Morph {0}
Defender
Protea Ultimus is all creature types.
0/5
Xeroc Processate
{3}{g}{g}
 
 C 
Unit – Dinosaur
Heroic
(Whenever a unit you control Assaults alone, it has +1/+1 for that cycle.)
Galaxies finest pilots.
4/3
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
I Take Your Future For My Own
 C 
Ongoing Scheme
Whenever a creature you control deals damage to an opponent, exile that many cards from the top of that player's library. You may play cards exiled this way.
When you play a card exiled with this scheme, abandon it.
Headstrong Healer
{3}{w}
 
 C 
Creature – Faerie Mystic
Flying
When Headstrong Healer enters the battlefield, if you have the least amount of life among all players, return Headstrong Healer its owner's hand and gain 3 life.
2/4
Goblin Treecrasher
{g/r}{g}
 
 C 
Creature – Goblin Warrior
Trample
3/2
Lightning Spear
{1}{r}
 
 C 
Instant
Lightning Spear deals 3 damage to target creature or player. If Lightning Spear deals damage to a creature, it also deals 1 damage to its controller.
Tamiyo's Moonbeam
{1}{u}
 
 C 
Instant
Tap target permanent. It becomes colorless until end of turn.
Draw a card.
Get Out Of Jail Free
{0}
 
 C 
Instant
Destroy target Aura enchanting a creature you control.
Chandra's Simulacrum
{2}{r}
 
 C 
Planeswalker
+1 Deal one damage to each player.
-1 Deal one damage to each white creature.
-6 Discard a number of cards equal to your life total, then draw three cards.
3
Nature's Strength
{1}{g}
 
 C 
Sorcery
Resonate — When you cast Nature's Strength, copy it for each card named Nature's Strength in all graveyards.
Put a +1/+1 counter on target creature.
"The complete might of the forest supports all I do." – Multani
Challenge # 029
 
 B 
Challenge
Design two "Future-Shifted" cards with different mechanics, but who's flavor puts them on the same plane.
Human
 T 
Creature – Human
1/1
Demon
 T 
Creature – Demon
3/3

Insanity Specter (rare)
Goblin Flamechanter (uncommon)
Elitist Charm (uncommon)
Protea Ultimus (uncommon)
Xeroc Processate (common)
Guardian Spirit (common)
I Take Your Future For My Own (common)
Headstrong Healer (common)
Goblin Treecrasher (common)
Lightning Spear (common)
Tamiyo's Moonbeam (common)
Get Out Of Jail Free (common)
Chandra's Simulacrum (common)
Nature's Strength (common)
Challenge # 029 (basic)
Human (token)