If there are two of these on the battlefield, each of them will modify each draw (after the first one if during the draw step) and will cause the player to discard or to mill a card
The thing that makes this bad is that for the amount of extra value it provides I would much rather run a basic land and make my colour production better
Cards like Thassa's Oracle are common win conditions in top Commander decks like Najeela and Sisay's flexibilty in card search
Ruby, Daring Tracker A mana dork with haste is good value, and having Ruby, Daring Tracker in the command zone could be a nice way to ensure you have some extra mana early in the game
Copying a counterspell or pump spell is virtually useless due to the timing on this ability, but imprinting a removal spell or draw spell can level the playing field against your opponents
The best Pokemon to use at this club are unsurprisingly, Fire Pokemon