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.

Demonic Force R Creature – Demon : Destroy target land. : Counter target black spell. This ability may only be used by your opponents. 5/5	Ring of the Blacksmith U Sorcery Equipped creatures you control get an additional +3/+0 until end of turn. At the beginning of your next upkeep, if all your opponents have more life than you, return Ring of the Blacksmith to it's owner's hand.	Stone Geyser U Enchantment All lands gain "Whenever this land is tapped for mana, it deals 1 damage to a creature you control. Creatures dealt damage this way gain flying until end of turn." "Dragons can fly. Big deal. They can't fall like we do." —Oop, Goblin Sledder	Brothers from the Slab U Creature – Human Druid : Reveal the top seven cards of your library, then put them on the bottom of your library in a random order. Add to your mana pool for each Druid revealed in this manner. We are cut from the same slab. Who among you is better than I? 2/2	Monsivore Rex C Creature – Lhurgoyf First strike Monsivore Rex gets +1/+0 for each Mountain you control and for each Mountain in your graveyard. "Oh, Saffi! Must you overreact to -" - Hans Eriksson, last words. 0/1
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	Unholy Pact C Enchantment – Aura Enchant Creature Enchanted creature gets +2/+1. When enchanted creature dies, return that card to the battlefield under your control. "You know how it is. Everyday it's 'trade my soul this', and 'give me more power that'. Of course I don't have more time to visit, Mum."	Cursed Blade C Artifact – Equipment : Attach Cursed Blade to target creature. Equipped creature gets +1/+1. , Sacrifice Cursed Blade: Destroy the last creature Cursed Blade was equipped to.	Curio Curse C Enchantment – Aura Enchant Creature When enchanted creature deals damage to a player, look at the top three cards of your library, put one in your hand, put the rest back in any order, then sacrifice Curio Curse. Enchanted creature must attack if able.	Learned Response C Instant You may pay 1 life and exile a blue card from your hand rather than pay Learned Response mana cost. Counter target non-creature spell.
Book Slide C Instant When you cast Book Slide, X cannot be more than the number of attacking and blocking creatures on the battlefield. Draw X cards. Each day, the Librarians of Lat-Nam fight against the growing tide of books. The books are winning.	Claws of the Viashino C Enchantment – Aura Enchant creature you control Flash : Enchanted creature gets +1/+0 until end of turn. Return Claws of the Viashino to its owner's hand: Sacrifice the enchanted creature and add to your mana pool.	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	Prismatic Surge C Instant As an additional cost to casting Prismatic Surge, discard a card. Target creature gets +X/+0 where X is equal to the discarded card's converted mana cost, and has protection from the colors of the discarded card.	Plains B Basic Land – Plains

Demonic Force (rare)
Ring of the Blacksmith (uncommon)
Stone Geyser (uncommon)
Brothers from the Slab (uncommon)
Monsivore Rex (common)
Necrospawn Liege (common)
Unholy Pact (common)
Cursed Blade (common)
Curio Curse (common)
Learned Response (common)
Book Slide (common)
Claws of the Viashino (common)
Evangelizing Aven (common)
Prismatic Surge (common)
Plains (basic)