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.

Patron of Self-Forgiveness R Creature – Angel Flash; convoke Flying When Patron of Self-Forgiveness enters the battlefield, you may return up to five creatures in play and/or in your graveyard to the top of your library. 5/5	Goat Sigil Bearer U Creature – Goat Flash, first strike Goat Sigil Bearer gets +1/+1 for each other creature you control. At the beginning of your opponent's end step, if Goat Sigil Bearer entered the battlefield this turn, sacrifice it. If you do, draw a card. 3/1	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.	Niven's Battlestone U Artifact When Niven's Battlestone enters the battlefield, target red creature can and must be blocked by exactly two creatures this turn. : Add to your mana pool. , , Sacrifice Niven's Battlestone: Destroy all non-land permanents with a converted mana cost of three or less.	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.
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.	Cho-Arrim Augury C Instant If an opponent controls a Swamp, and you control a Plains, you may cast Cho-Arrim Augury without paying its mana cost. Draw a card, then put a card from your hand on top of your library. Then look at the top four cards of your library and put them back in any order.	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	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
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	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.	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.	Creative Eyry C Instant When you cast Creative Eyry, cannot be greater than the number of flying creatures you control. Draw X cards.	Mountain B Basic Land – Mountain

Patron of Self-Forgiveness (rare)
Goat Sigil Bearer (uncommon)
Gates of Velis Vel (uncommon)
Niven's Battlestone (uncommon)
Harmonic Vale (common)
Krimson Kount (common)
Steadfast Assault (common)
Cho-Arrim Augury (common)
Walking Nightmuse (common)
Kyren Tax Collector (common)
Plume Serpent (common)
Book Slide (common)
Pull of Pyromancy (common)
Creative Eyry (common)
Mountain (basic)