To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Darkness Crystal's first ability)
in 20% of packs you'll also get a Traditional Foil Land card WELCOME TO THE GATHERING - Magic: The Gathering is a collectible card game that weaves deep strategy, gorgeous art, fantastical stories, and a thriving fan community all together into a card game experience like no other Contents: 1 Sealed Play Booster Pack 15 Randomized Cards Limit 12 per customer
If you control a commander, you may choose both instead
You choose targets for that ability as it goes on the stack
Introduced in later sets, these cards stay on the board once played
Initially, Chernabog, Evildoers cost might appear entirely unreasonable