I have no fully confirmed truth about a lot of these things, only a "best bet", and every now and then some new info about pre-Alpha playtest cards comes out and turn things on its head
You dont need to take every legendary card you see, either, meaning you can dig through the top of your library for that Piru, the Volatile, make the rest into Treasure tokens, and ramp into dropping your huge dragon way early
Artifact Theme R&D is making a conscious shift to move toward more colored artifacts to allow us to use artifact themes without causing tournament issues
Hogaak, Arisen Necropolis Modern (and Legacy to an extent) was dominated by Hogaak, Arisen Necropolis for a while
The fourth land is often a swinging point in a game and if either player misses that land drop the chances of them losing increase significantly for most decks
Gyarados VMAX #29 Pokemon Evolving Skies Keep track of your collection value over time