Rosewater demonstrated the difference between the acorn-stamp designs and those that will be Legacy- and Commander-legal with our first spoiler cards
It's nice to have, building out a certain set's lore/story or including a fun little reference, but it's not wholly necessary to the function of the card
A tube or sleeve is ideal for long-term storage

A Most Helpful Weaver Abuelo's Awakening Abyssal Harvester Activated Sleeper Adaptive Automaton Adrestia Aerial Modification Aggressive Symbiosis Alien Symbiosis Angelic Destiny Anikthea, Hand of Erebos Animate Spell (playtest) Answered Prayers Antarctic Research Base Applied Aeronautics Applied Geometry Aquitect's Will Arbiter of the Ideal Archangel Elspeth Argent Mutation Ascent of the Worthy Ashes of the Fallen Ashiok, Nightmare Weaver Ashnod's Transmogrant Assemble from Parts Astrologian's Planisphere Auto-Key Auton Soldier Avatar Destiny Awakened Skyclave Bard's Bow Bello, Bard of the Brambles Black Mage's Rod Bloodbat Summoner Blue Mage's Cane Breach the Multiverse Brenard, Ginger Sculptor Brotherhood Regalia Butch DeLoria, Tunnel Snake Cactarantula Saddle Call a Surprise Witness Call to Serve Captivating Vampire Case of the Filched Falcon Case of the Gorgon's Kiss Clavileo, First of the Blessed Coerced to Kill Coercive Recruiter Cool Fluffy Loxodon Copy Artifact Copy Land Coward // Killer Coward // Killer Curious Colossus Cursecloth Wrappings Dancer's Chakrams Dark Knight's Greatsword Daxos's Torment Deceptive Frostkite Demonic Embrace Dermotaxi Dismiss into Dream Displaced Dinosaurs Doc Ock, Evil Inventor Does Machines Dollhouse of Horrors Don Andres, the Renegade Donal, Herald of Wings Donatello, Mutant Mechanic Draconic Destiny Dragoon's Lance Drana, the Last Bloodchief

If you don't control a creature with a counter on it at that time, the ability won't resolve and none of its effects will happen
1 Land There are 15 total basic lands that can be opened in Play Boosters: 10 regular basic lands and 5 Western landscape basic lands