Yet another card dump (Circeus's): 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.
Azor's Librarian
{1}{w}{u}
 
 R 
Creature – Spirit
Flying, lifelink
Whenever Azor's Librarian becomes the target of a spell an opponent controls, you may draw a card.
2/1
Extensible Wall
{1}{w}
 
 U 
Creature – Wall
Defender
{1}: Extensible Wall can block an additional creature this turn.
Extensible Wall gets +0/+2 for each creature it's blocking beyond the first.
2/2
Unbound Charity
{w}{u}{g}
 
 U 
Instant
Choose a counter type on target creature you control. Put one of those counters on each other creature you control.
Forceful Enrolment
{2}{u}
 
 U 
Enchantment
When Forceful Enrolment enters the battlefield, choose two creature types.
Creatures you control of the first chosen type are also the chosen second type in addition to their other types.
Heft of Thoughts
{2}{u}
 
 C 
Instant
Spy on a player. (To spy, choose land or nonland, then reveal the top card of that player's library.)
If you spied correctly, put two +1/+1 counters on that creature and it gains flying until end of turn. Otherwise, that creature gets +2/+2 and gains flying until end of turn.
Burning Claws
{1}{r}
 
 C 
Instant
Target creature gets +1/-1 and gains haste until end of turn. Draw a card.
"Hooking scorching metal to the bones turned out best at getting the reaction we were looking for."
—Sulka, goblin rigger
Composure
{u}
 
 C 
Instant
Creatures who attacked this turn don't untap during their controller's next untap step.
A good poker face is often a mage's greatest weapon.
Death Glide
{1}{b}
 
 C 
Enchantment – Aura
Enchant creature
Enchanted creature has "{1}{b}: Regenerate this creature. If {u} was spent to pay this cost, it gains flying until end of turn."
Aura Bubble
{1}{w}
 
 C 
Instant
Target permanent gains protection from the color of your choice until end of turn.
Overfeeding
{2}{b}
 
 C 
Enchantment – Aura
Enchant creature
Enchanted creature gets +2/-2 and has lifelink.
Freezemist Shaman
{1}{g}
 
 C 
Creature – Human Shaman
{t}: Add {g} to your mana pool.
Ferocious — Freezemist Shaman has "{t}: Add one mana of any color to your mana pool." as long as you control a creature with power 4 or greater
1/1
Automatization
{g}
 
 C 
Artifact Enchantment – Aura
Enchant land.
Enchanted land has "{t}: Add {2} to your mana pool." If it is a nonbasic land, it has "{t}: Add {3} to your mana pool." instead.
Thanathonautics
{1}{b}
 
 C 
Instant
Choose a permanent. Search your library for a card with the same name as the chosen permanent and put it into your graveyard, then shuffle your library.
Growth Salve
{b}{g}
 
 C 
Instant
Regenerate target creature. Put a +1/+1 counter on it.
Plains
 
 B 
Basic Land – Plains

Azor's Librarian (rare)
Extensible Wall (uncommon)
Unbound Charity (uncommon)
Forceful Enrolment (uncommon)
Heft of Thoughts (common)
Burning Claws (common)
Composure (common)
Death Glide (common)
Aura Bubble (common)
Overfeeding (common)
Freezemist Shaman (common)
Automatization (common)
Thanathonautics (common)
Growth Salve (common)
Plains (basic)