Darksteel booster pack
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This booster pack contains 1 Rare, 3 Uncommon and 11 Common. All Darksteel cards are Blackborder. 1 premium Foil card is included in every 5th booster pack (1 per 70 cards)
Darksteel introduces two new abilities to the Mirrodin block and expands on affinity by including spells that have affinity for different basic land types.
Indestructible - Indestructible permanents can't be destroyed. Not by anything. If a spell tries to destroy an indestructible permanent, nothing happens--not even if the spell prevents Regeneration.
Modular - Modular is always listed with a number; an artifact creature with modular comes into play with that many +1/+1 counters on it. When that creature is put into a graveyard, you can put its +1/+1 counters onto any other artifact creature in play.