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 – Bear
Honeyed Bear has protection from each of its colors.
Don't try to outswim a Honeyed Bear; it will outswim you, then eat you. Of course, you could dive deep underwater. In that case you'll get some exercise before it grows gills and fins and eats you.
2/2
 U 
Creature – Troll
When Defender of the Sedge enters the battlefield, search through your library for a creature with a converted mana cost equal to or less than the number of creatures an opponent has in play, and put it on the battlefield. Then, shuffle your library.
{b}: Regenerate Defender of the Sedge.
2/2
 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.
 U 
Sorcery
As an additional cost to cast Volcanic Cannonade, sacrifice any number of creatures you control.
Deal X damage to up to X target creatures and/or players, where X is equal to the number of creatures sacrificed.
"Oh, goblins fly all the time. They're never happy about it, mind you."
-Ethan Sable, Icatian Lieutenant
 C 
Instant
Target creature becomes a 2/3 green Plant Wall with defender and "{g}: Regenerate this creature." until end of turn.
Wrap arms and roots together, be convulsed with grief, and bring back chaos out of shape.
- Conrad Aiken, The Room
 C 
Artifact – Equipment
{2}: Attach Cursed Blade to target creature.
Equipped creature gets +1/+1.
{b}, Sacrifice Cursed Blade: Destroy the last creature Cursed Blade was equipped to.
 C 
Instant
When you cast Creative Eyry, {x} cannot be greater than the number of flying creatures you control.
Draw X cards.
 C 
Creature – Drake
Flying
{1}{b}, {t}, Exile a card from your graveyard: Target player discards a card. Activate this ability only any time you could cast a sorcery.
2/4
 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
 C 
Instant
Until end of turn, blocking creatures neither deal, nor receive combat damage, and gain "{t}: Deal 1 damage to target attacking creature".
 C 
Creature – Minotuar Warrior
When Talruun Firebrand enters the battlefield, it deals 3 damage to all players.
Quiet! I cannot promise victory for our tribe, but I will promise an end to the fighting!
3/3
 C 
Creature – Lhurgoyf
First strike
Monsivore Rex gets +1/+0 for each Mountain you control and for each Mountain in your graveyard.
"Oh, Saffi! Must you overreact to -"
- Hans Eriksson, last words.
0/1
 C 
Creature – Elemental Shaman
Protection from enchantments
{w}, Discard Anti-Aura Acolyte: Target creature gains protection from enchantments until end of turn.
2/2
 C 
Creature – Zombie Cleric
Tap an untapped creature you control, or lose 1 life: Put a devotion counter on Necrospawn Liege.
Remove five devotion counters from Necrospawn Liege: Draw a card.
3/3
Swamp
 
 B 
Basic Land – Swamp

Honeyed Bear (rare)
Defender of the Sedge (uncommon)
Carpet of Lava (uncommon)
Volcanic Cannonade (uncommon)
Turn to Brambles (common)
Cursed Blade (common)
Creative Eyry (common)
Thanatos Drake (common)
Evangelizing Aven (common)
Snowball Fight (common)
Talruun Firebrand (common)
Monsivore Rex (common)
Anti-Aura Acolyte (common)
Necrospawn Liege (common)
Swamp (basic)