Planar Chaos booster pack
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This booster pack contains 1 Rare, 3 Uncommon and 11 Common cards. All Planar Chaos cards are Blackborder. 1 premium Foil card is included in every 5th booster pack.
The second set in the Time Spiral block, Planar Chaos features 165 cards with randomly-inserted premium cards. All cards in the set are tournament legal.
Starting with Time Spiral, there has been a change in how premium cards are distributed. Previously, premium cards replaced a card of the same rarity, so a premium rare would replace a standard rare, a premium uncommon would replace a standard uncommon, and a premium common would replace a standard common. In Time Spiral and in future sets, all rare, uncommon, and common premium cards will replace a standard common instead. It is now possible for there to be two rares in one pack: the standard rare card plus a premium rare (which replaces a standard common).