Mashup: the Gathering Workbench: Virtual Booster

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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.
 R 
Creature – Angel Cat
Ajani's Chosen's power and toughness are equal to the number of lands you control.
{3}{w}{w}, Sacrifice five lands: Destroy all other creatures, then regenerate Ajani's Chosen.
*/*
 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.
 U 
Creature – Human Druid
{t}: Reveal the top seven cards of your library, then put them on the bottom of your library in a random order. Add {g} 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
 U 
Creature – Deer
{w}, Sacrifice Dawnfield Puredeer: If a source would deal damage to you or a creature you control this turn, prevent 1 of that damage.
{2}{w}, Sacrifice Dawnfield Puredeer: If a source would deal damage to you or a creature you control this turn, prevent 2 of that damage.
2/2
 C 
Creature – Bird Shade
Flying
Sacrifice a land: Return Shade of Prey to its owner's hand.
{b}: Shade of Prey gets +1/+1 until end of turn.
2/1
 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
 C 
Creature – Devil Mercenary
Flying
It's hard to call it flying, the way they seem to fall out of the sky, collapsing on their prey.
1/1
 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.
 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.
 C 
Instant
Tap two target lands, then add {r}{r} to your mana pool. Draw a card.
 C 
Enchantment – Aura
Enchant Land
Enchanted Land gains protection from other enchantments.
Sacrfice Savaen Blessing: Destroy target enchantment.
"When the land is pure, the magic will follow."
-Sidaen of Savaen
 C 
Enchantment – Aura
Enchant creature you control
Flash
{r}: 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 {r}{r} to your mana pool.
 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.
 C 
Instant
When you cast Creative Eyry, {x} cannot be greater than the number of flying creatures you control.
Draw X cards.
Mountain
 
 B 
Basic Land – Mountain

Ajani's Chosen (rare)
Ring of the Blacksmith (uncommon)
Brothers from the Slab (uncommon)
Dawnfield Puredeer (uncommon)
Shade of Prey (common)
Plume Serpent (common)
Unloved Devil (common)
Prismatic Surge (common)
Cho-Arrim Augury (common)
Mishra's Rite (common)
Savaen Blessing (common)
Claws of the Viashino (common)
Steadfast Assault (common)
Creative Eyry (common)
Mountain (basic)