The former drops on the third turn, you can spend two mana and sacrifice a Snow-Covered Land to Fog this turn, and any turn thereafter
Like Creature types, the Lesson subtype doesn't have any effect on the mechanics of the card but instead allows other cards to refer to and interact with them specifically
In a solo Ojama deck, they tend to act more like a stun engine, preventing the opponent from being able to use their zones while altering the statline of Monsters to oftentimes give them lower Attack
Kellogg, apart from being a nice cereal, fits into Most Wanted perfectly
Aristocrats is often a tricky deck to build, since you need to balance fodder generation, sacrifice outlets, and payoffs