The card reads: Whenever an opponent casts a spell, you may draw a card unless that player pays one mana. This leads to a lot of extra cards, but it results in whoever plays it having to constantly ask if people will be paying one mana to stop them from drawing a card
If, among the 5 mythic lands, Wizards prints just ONE good card, it's going to be in all of the decks that run that color
Specifically, this means you can create a token that's a copy of the artifact you just put onto the battlefield (which perhaps you just drew) and then put +1/+1 counters on it if it's also a creature
Halana and Alena, Partners is the perfect representation of that, and its a card that returns to Standard thanks to Foundations
The monarch mechanic from Conspiracy: Take the Crown encouraged attacking, but it also helps spread around ways to draw an extra card or three