Mashup: the Gathering Workbench: Virtual Booster

Icy Proctor    R  Creature – Crab Cleric Adrift (At the beginning of your upkeep, simultaneously exile all adrift creatures you control on the battlefield, and return all exiled adrift creatures you own to the battlefield. They gain haste.) All other blue creatures you control gain +1/+1. When Icy Proctor enters the battlefield, put two 1/1 blue crab tokens into play. 3/3	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.)	Carpet of Lava    U  Enchantment Flash At the beginning of each phase, add X red mana to your mana pool, where X is equal to the number of Islands all opponents control. At the beginning of the end of turn, sacrifice Carpet of Lava.	Gates of Velis Vel    U  Enchantment Untapped creatures you control are walls and gain +0/+2. Tapped creatures you control are all creature types except walls and gain +2/+0.	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.
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	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.	Holy Favor    C  Enchantment – Aura Enchant Creature Enchanted creature gets +2/+1. At end of turn, return Holy Favor to its owner's hand.	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.	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.
Creative Eyry    C  Instant When you cast Creative Eyry, cannot be greater than the number of flying creatures you control. Draw X cards.	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	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	Rat Nest Ogre    C  Creature – Ogre Discard a card at random from your hand: Rat Nest Ogre can't block this turn. Any player may play this ability. "Been living with the rats too long. Can no longer see. Rats don't mind, though. Just give me their eyes." 4/1	Island    B  Basic Land – Island

Icy Proctor (rare)
Sapling Grove (uncommon)
Carpet of Lava (uncommon)
Gates of Velis Vel (uncommon)
Steadfast Assault (common)
Plume Serpent (common)
Prismatic Surge (common)
Holy Favor (common)
Harmonic Vale (common)
Book Slide (common)
Creative Eyry (common)
Walking Nightmuse (common)
Corona of Power (common)
Rat Nest Ogre (common)
Island (basic)