Resource management is a key element of Magic: The Gathering, as anyone who's ever had too few (or too many) lands in hand will tell you
smpratte: There are so many threads that capture that spirit, but some of the big ones that come to mind are Secret Santa, Signature exchange, and as you mentioned the E4 Chain Letter
Another major player is "Ritual Beast Ulti-Cannahawk," a Contact Fusion Monster whose ability allows the player to return two Banished Ritual Beasts cards to their Deck to add another from their Deck to the Hand
Create five 1/1 white Human creature tokens
If a "Jester Queen" would be destroyed while face-up on your opponent's side of the field, destroy all "Jester Queen" cards on the field and inflict 800 damage to your opponent for each.[/spoiler] [spoiler='Show Effect']When this face-up card is targeted for an attack, you may reveal 1 "Joke" card from your Deck and send it to the Graveyard
These cards, while often bought in the gambling-lite hope of pulling a rare card, actually exist to be the playing cards for a massively popular game