Silly String: 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.
Knowledge Hot Tub
 
 R 
Artifact Land – Island Mountain
(Knowledge Hot Tub isn't a spell)

{t}: Add {u} or {r} to your mana pool.
I almost forgot that this was an un-set when naming the dual artifact lands.
Phyrexian Forest
 
 U 
Phyrexian Land – Forest
{t}: Add {pg} to your mana pool.
What's the Point of This?
{0}
 
 U 
Place Holder
Place Holders are non-spell permanents that are not land.
When Place Holder is chosen as a permanent type for an effect, flip What's the Point of This?.
Seal Your Fate
 
 C 
Artifact Creature Land
At At the beginning of your upeep target opponent chooses if Seal Your Fate is a land that produces {1}, an indestructible artifact, or a 1/1 white/blue/black/red/green changeling token.
When Seal Your Fate is the only permanent you control, transform it.
Because I Say So
{1}{u}{u}
 
 U 
Sorcery
Until end of turn if you would choose a mode on a card you may choose a different, additional mode as well.
The Birdie
{u}
 
 C 
Creature – Bird
Flying

If you give the finger to an opponent after you counter a spell of his or her's The Birdie becomes unblockable until the end of the turn.
1/1
Aggrofail
{g}
 
 C 
Creature – Beast
Defender
Aggrofail can't block.
Get ready for my turn 1 0/12 that sits here.
0/12
Old Fart
{3}{g}{b}
 
 C 
Creature – Hag
During your upkeep put an age counter on Old Fart.
Old Fart cannot be blocked by creatures with a converted mana cost less than the number of age counters on Old Fart.
2/3
Tighty Whities
{1}{w}
 
 C 
Enchantment – Aura
Enchanted creature doesn't untap during its controllers untap step unless its power and toughness are both less than 3.
Free Zebra
{0}
 
 C 
Colour indicator W Sorcery
Put a 1/1 white zebra token into play for each plains you control from the Mirage block that contains a zebra in the art.
Good Eats
{g}{g}
 
 C 
Instant
Gain life equal to the number of suggested servings of the food you're currently eating.
The Power of Youth
{1}{r}{r}
 
 C 
Sorcery
Creatures the youngest player controls gain +1/+1 and first strike until end of turn.
Zom Bee
{2}{b}
 
 C 
Creature – Zombie Insect
Flying
{t}, sacrifice Zom Bee: Deal one damage to target creature.
1/1
Grizzly Beard
{1}{g}
 
 C 
Enchantment
Creatures you control get +1/+1 if you have a bushy beard.
Sexy Elf
{2}{g}
 
 C 
Creature – Elf Druid
If any opponent is staring at Sexy Elf you may begin counting to five. If any opponents do not look away when you reach five Sexy Elf gains non-basic landwalk.
2/2
Swamp
 
 B 
Basic Land – Swamp

Knowledge Hot Tub (rare)
Phyrexian Forest (uncommon)
What's the Point of This? (uncommon)
Because I Say So (uncommon)
The Birdie (common)
Aggrofail (common)
Old Fart (common)
Tighty Whities (common)
Free Zebra (common)
Good Eats (common)
The Power of Youth (common)
Zom Bee (common)
Grizzly Beard (common)
Sexy Elf (common)
Swamp (basic)