Mashup: the Gathering Workbench: Virtual Booster

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.

Void Specter R Creature – Specter When Void Specter deals combat damage to a player, that player reveals cards from his or her hand equal to the amount of damage Void Specter dealt and you choose one of them. That player discards that card. : Void Specter gets -0/-3 and gains flying until end of turn. 3/4	Catching Searblades U Creature – Elemental Warrior Whenever you play an activated ability of an Elemental, put a 1/1 red Elemental Warrior token into play. An army is only limited by the fuel that feeds it. 3/3	Villainous Heart U Creature – Demon When Villainous Heart enters the battlefield, sacrifice an Ogre, or sacrifice Villainous Heart. When Villainous Heart attacks, all Ogres and Demons get +2/+2 until end of turn. : Regenerate Villainous Heart. 3/2	Sapling Grove U Land , : Add to your mana pool. Level Up If Sapling Grove has 3 level counters, it becomes a 3/3 green Treefolk with trample and "Remove a level counter from Sapling Grove: Sapling Grove gets +2/+2 until end of turn." (It's still a land.)	Harmonic Vale C Enchantment As Harmonic Vale enters the battlefield, choose a color. Whenever a player casts a spell of the chosen color, you may pay . If you do, you gain 2 life.
Snowball Fight C Instant Until end of turn, blocking creatures neither deal, nor receive combat damage, and gain ": Deal 1 damage to target attacking creature".	Evangelizing Aven C Creature – Bird Soldier Flying As long as Evangelizing Aven is tapped, it gets +2/-2. "They keep screaching 'Repent! Repent! Repent!'. What will it take to stop their infernal squaking?" - Halina, Dwarven Trader 2/4	Kyren Tax Collector C Creature – Goblin Advisor Haste If an opponent controls more lands than you, you may play Kyren Tax Collector without paying its mana cost. In Mercandia, there's a tax for future land you will buy. 1/1	Thanatos Drake C Creature – Drake Flying , , Exile a card from your graveyard: Target player discards a card. Activate this ability only any time you could cast a sorcery. 2/4	Corona of Power C Snow Snow Snow Enchantment – Aura Enchant green creature. Enchanted creature gains ": Deal damage to target player equal to this creature's power. I call on forest's strength – on every thorn on every bramble – for their mass to break our enemies. -from The Fire within All
Unloved Devil C Creature – Devil Mercenary Flying It's hard to call it flying, the way they seem to fall out of the sky, collapsing on their prey. 1/1	Necrospawn Liege C Creature – Zombie Cleric Tap an untapped creature you control, or lose 1 life: Put a devotion counter on Necrospawn Liege. Remove five devotion counters from Necrospawn Liege: Draw a card. 3/3	Steadfast Assault C Sorcery Deal 1 damage to all creatures your opponents control. Creatures you control get +0/+3 until end of turn. Ha! Conviction? Your 'noble spirit' might win wars, but first you'll need to keep your flesh intact.	Friend Ward C Enchantment – Aura Enchant creature Enchanted creature gains protection from its colors. This effect does not remove Friend Ward. "When you wield authority, there is no greater threat to yourself, than yourself." -The Lord of Atlantis	Swamp B Basic Land – Swamp

Void Specter (rare)
Catching Searblades (uncommon)
Villainous Heart (uncommon)
Sapling Grove (uncommon)
Harmonic Vale (common)
Snowball Fight (common)
Evangelizing Aven (common)
Kyren Tax Collector (common)
Thanatos Drake (common)
Corona of Power (common)
Unloved Devil (common)
Necrospawn Liege (common)
Steadfast Assault (common)
Friend Ward (common)
Swamp (basic)