This is a brand new cube! It contains nothing but lands and spells with a mana value of 3. There are some alternate costs (Madness, Kicker, etc), but mostly you’ll be spending 3 for each spell. Fixing comes in the form of mana rocks and tapped tri lands.

The only real outlier is Foretell, which does provide something to do with 2 mana, and a surprise for a later turn.

Archetypes in a nutshell:
Azorius - Fliers, Control
Boros - Equipment
Dimir - Ninjas
Golgari - Graveyard
Gruul - Haste, Fight/Bite
Izzet - Wizards, Spells
Orzhov - Drain
Rakdos - Vampires, Sacrifice
Selesneya - +1/+1, Tokens
Simic - Snakes