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.

Righteousness Elemental R Creature – Elemental When Righteousness Elemental enters the battlefield, put X +1/+1 counters on it, where X is equal to the amount of damage dealt to all opponents this turn. Then, if an opponent controls a black creature, Righteousness Elemental gains haste and after this main phase, there is an additional combat phase followed by an additional main phase. 0/0	Elite Trapper U Creature – Merfolk Ranger , : Return target attacking creature to its owner's hand. , : Return all attacking creatures to their owner's hand. Activate this ability only if there are exactly two attacking creatures. Runaway lovers are her specialty. 3/3	Coffertooth Rats U Creature – Rat Whenever a Rat enters the battlefield under your control, untap all Rats you control. They gain Intimidate until end of turn. With each new member, their frenzy increases. The rat sense of community fails, as sharp teeth replace sharp wits. 2/1	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	Krimson Kount C Creature – Kobold Noble Whenever you cast a Kobold, put a Destiny counter on Krimson Kount. Remove a Destiny counter from Krimson Kount: Krimson Kount becomes a 3/4 Kobold Warrior Spirit until end of turn. 0/1
Blessing Unbent C Instant As you cast this spell, you may untap two tapped white creatures. When you do, copy it and you may choose a new target for the copy. Target creature gains +2/+2 until end of turn.	Wicked Witch Engine C Artifact Creature – Elemental Horror : Target player dealt damage by Wicked Witch Engine this turn loses 1 life. 2/2	Pull of Pyromancy C Enchantment When Pull of Pyromancy enters the battlefield, put a 3/3 Red Elemental creature token onto the battlefield. At the beginning of each player's upkeep, Pull of Pyromancy deals 1 damage to that player, unless he or she controls an Elemental.	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."	Coast Guarder C Creature – Bird Soldier Scout Flying Whenever an opponent casts a creature spell, put a +1/+1 counter on Coast Guarder. 2/1
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.	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".	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.	Plume Serpent C Creature – Serpent When Plume Serpent enters the battlefield, you may search your library for an Island card and put it onto the battlefield tapped under target player's control. If you do, shuffle your library. Plume Serpent can't attack unless defending player controls an Island. 6/5	Swamp B Basic Land – Swamp

Righteousness Elemental (rare)
Elite Trapper (uncommon)
Coffertooth Rats (uncommon)
Catching Searblades (uncommon)
Krimson Kount (common)
Blessing Unbent (common)
Wicked Witch Engine (common)
Pull of Pyromancy (common)
Unholy Pact (common)
Coast Guarder (common)
Cursed Blade (common)
Snowball Fight (common)
Learned Response (common)
Plume Serpent (common)
Swamp (basic)