Each of these packs included a foil 'Masterpiece' card, a reprint of an older card with a unique new treatment, with the complete Mythic Edition including eight Masterpiece cards
Yesterday WOTC had a surprise announced for a new premium set Double Masters
Its still used that way in Premodern, Vintage, and Legacy, adding spice like Kalastria Healer or Spike Feeder of all things in some builds, and looking to infinitely bounce your creatures for Grapeshot in others
The only issue, assuming you don't consider costing ten mana an issue, is that resolving four cascades in a row can get complicated, especially when individual cascades hit other cascade spells mid-resolution
You won't get +1/+1 counters, even if you sacrifice a creature
While proto ward increases the cost of a spell, this frost armor/ward counters the spell unless the cost is paid