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These force your opponent to discard a card from their hand, and while this might not appear all that powerful at first glance, repeatedly forcing your opponent to discard cards or being able to choose a specific card from your opponent's makes discard effects worthwhile

Packs may randomly contain a foil card of any rarity, which replaces 1 card in the Common slot

Again, not just yours, but everyone's

It does depend heavily on Jeskai Revelation, making answers like Ancient Vendetta (which North Wind Avatar can find) particularly troublesome

Only if theyre already legal as part of a Standard-legal set if not, they arent

Even the ability to take out multiple additional card types combined with the ability to take out multiple copies of that card, or multiple copies of the same token, does not come close to compensating for sorcery speed