Philosophers Stone makes the 1st spell of each element cast by the bearer each turn costs 1 less
When in your graveyard this faerie can serve another purpose
So, while some cards might be incredible in one or two niche decks, were not as interested in giving them air time
Once a land is tapped, it is considered 'spent', and can't be activated again until untapped, which will happen automatically at the start of that player's next turn
This is a cute joke, until you realize you need to organize each of those Very Cryptic Commands with four different effects
In terms of what the decks do, the Tyranid Swarm deck focuses on building a massive army with adaptable creatures and counters, though it falls slightly short in power compared to the other decks