Once each turn, including on your opponents' turns, you can cast a spell with mana value X or less for free where X is the number of time counters on As Foretold
There are also a lot of good cards that give this effect, such as the mighty Flickerwisp, but only ten can make it into the best flicker cards in MTG
#3 Entangler Set: Prophecy Printing: Normal Increase: +$8.75 Current Market Price: $10.04 This forgotten Uncommon from 2000 was suddenly thrust into the limelight by the release of Marvels Spider-Man and the popular new commander Anti-Venom, Horrifying Healer
You don't have to add four copies of each card to your deck though, and sometimes it's beneficial to have fewer copies and make room for other important cards
The Secret Lair drops themselves are significantly increasing the supply of some of these cards (we have already seen the original printings of some Secret Lair reprints dropping in price, like Marrow-Gnawer), and even if Magic continues to grow, the supply of these reprints is high enough that, at least for most, it's unlikely they will explode in price in the near future
This Boros commander also works well in aggressive and lifegain-focused decks, where Arabella, Abandoned Dolls attack trigger can turn a board full of small creatures into a significant advantage with cards like Heliod, Sun-Crowned, for example
