Mashup: the Gathering Workbench: Virtual Booster

Dive Deeper    U  Enchantment At the beginning of your upkeep, put a pressure counter on Dive Deeper. At the beginning of your precombat main phase, exile up to X target cards in a single graveyard, where X is equal to the number of pressure counters on Dive Deeper. Then, if there are four or more pressure counters on Dive Deeper, sacrifice it.	Racket Buster    R  Creature – Human Soldier Flash When Racket Buster enters the battlefield, if it is the upkeep step, end the step. 2/3	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	Knight of the Periphery    U  Creature – Thalakos Knight Knight of the Periphery can't be blocked except by unblockable creatures or by creatures named Knight of the Periphery. 'Never', Mirri, is the same as 'Not yet'. -Ertai, Wizard Adept 4/3	Roiling Fire    U  Sorcery When you cast Roiling Fire, exile it from the game with X time counters on it. At the beginning of your upkeep, if Roiling Fire is exiled, remove a time counter from it. If you do, deal 5 damage to target creature.
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.	Walking Nightmuse    C  Creature – Spirit Creatures can't block Walking Nightmuse unless their controller discards a card for each creature he or she controls that's blocking Walking Nightmuse. 4/2	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.	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	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.
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.	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	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.	Plains    B  Basic Land – Plains

Dive Deeper (uncommon, foil)
Racket Buster (rare)
Villainous Heart (uncommon)
Knight of the Periphery (uncommon)
Roiling Fire (uncommon)
Harmonic Vale (common)
Walking Nightmuse (common)
Book Slide (common)
Thanatos Drake (common)
Curio Curse (common)
Evangelizing Aven (common)
Prismatic Surge (common)
Krimson Kount (common)
Steadfast Assault (common)
Plains (basic)