First, the Forest cards it fetches come in untapped (barring other clauses), which means you can use that mana immediately effectively reducing its net cost to 2 mana during the turn you play while ramping you by 2 lands for the rest of the game
Comments from Last Week What do you think about the double-sided foil tokens from the Eldritch Moon prerelease
You get another card so that's mad card flow
The chart provided above from Imgur happens to be one of the more detailed ones, and, for the most part, its a pretty good representation of a commonly accepted Commander power level scale
Could it be something dangerous
You can drop them early or free any time to break folks faces, and good free stuff is always good, but many in Commander might go with the 4/4 Wurms first in a Commander brew with 40 life to get too and trample too