Silly String: Virtual Booster

[-] [+]
15 random cards from the set.
You could alternatively have a booster in the usual rarity pattern.
 C 
Enchantment – Aura
Enchanted creature doesn't untap during its controllers untap step unless its power and toughness are both less than 3.
 R 
Artifact Land – Swamp Forest Set
(Tel-Jilad Horror Filming Location isn't a spell)

{t}: Add {b} or {g} to your mana pool.
This is intended to be a "pop-out card." Like a children's book, houses, trees, and zombies will pop-out when played. Casting is the player's problem however.
 C 
Instant
Gain life equal to the number of suggested servings of the food you're currently eating.
 C 
Enchantment
Creatures you control get +1/+1 if you have a bushy beard.
{{5}/{w}}{{5}/{u}}{{5}/{b}}{{5}/{r}}{{5}/{g}}
 
 R 
Instant
You win the game if every permanent from your deck is on the battlefield, and all instants and sorceries your deck contains are on the stack.
Foe's Death
 
 U 
Colour indicator MULTI Artifact Creature Land – Changeling Avatar
{t}: Add {1} to your mana pool.
Foe's Death gets +1/+1 for each Place Holder you control.
At the beginning of your upkeep target land becomes a copy of target artifact or creature.
At the beginning of your upkeep target
artifact becomes a copy of target land or creature.
At the beginning of your upkeep target creature becomes a copy of target land or artifact.
4/4
 R 
Enchantment
Choose a format. Exile all cards illegal in that format.

If an illegal card in that format other than Okay buddy, this is [insert format here] would be cast or enter the battlefield exile it instead.
 R 
Creature – Antelope
Swampwalk

When Graveful ANTElope deals combat damage to a player each players antes a land card from his or her graveyard.
1/4
 R 
Artifact Land – Island Swamp
(Lumegrind's Vault isn't a spell).

{t}: Add {u} or {b} to your mana pool.
I wonder how many casual players would allow these into their playgroups.
 U 
Sorcery
Until end of turn if you would choose a mode on a card you may choose a different, additional mode as well.
 R 
Creature – Lhurgoyf
Artivore's power and toughhness are equal to the number of different artists named on all cards on the battlefield and in all player's graveyards.
*/*
 U 
Instant
Any number of players may pull any number of cards from outside of the game from the back pockets of their pants. All cards containing the letters with either two "P"s or two "O"s in their names are shuffled into their respective player's decks.
Sly
{u}{u}{u}
 
 R 
Creature – Shapeshifter
Changeling (This card is every creature type at all times.)

At any time you may hide Sly underneath a permanent you control on the field for {0}. When that permanent exits the battlefield, Sly enters play.
4/2
 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
 U 
Sorcery
Search your library for a card that contains the text "Search your library for" and place it on top of your library.

Tighty Whities (common)
Tel-Jilad Horror Filming Location (rare)
Good Eats (common)
Grizzly Beard (common)
Play All the Cards (rare)
What's the Point of This/ Seal Your Fate (uncommon)
Okay buddy, this is [insert format here] (rare)
Graveful ANTElope (rare)
Lumegrind's Vault (rare)
Because I Say So (uncommon)
Artivore (rare)
Poop Shoot (uncommon)
Sly (rare)
Old Fart (common)
Tutor's Tutor (uncommon)