A small section in my cube's box that's dedicated to teaching new players how to play, focusing on evergreen mechanics and basic colour effects. It uses five 20 card decks, one for each colour. Wherever possible, versions of cards are used that have reminder text of mechanics on them.
Instructions for use:
The cube will try to focus on the following effects for each colour:
Keywords: First Strike, Lifelink, Indestructible, Vigilance
Abilities: Anthems, Tokens
Keywords: Flying, Flash, Hexproof, Scry
Abilities: Bounce, Card Draw
Keywords: Deathtouch, Menace
Abilities: Graveyard, Recursive threat, Dies triggers
Keywords: Haste, Prowess, Menace
Abilities: Can't block, Burn spells
Keywords: Trample, Reach
Abilities: Mana elves, Tokens
Better card name and it has reminder text - functionally identical swap.