Ten mana is a lot, which is why you can also reduce the cost of it by one mana for each untapped creature you tap as you cast it
I dont know if itll actually work well or not, but I think its a very interesting design choice nonetheless
The best rares and mythics are far better than the best commons and uncommons
THE FIRST STEPS AFTER THE LAST STANDRebuild the Multiverse while building up your collection in this epic conclusion to the March of the Machine storyline INTRODUCING EPILOGUE BOOSTERSThese special boosters fill in the story between sets with 5 Magic: The Gathering cards in each pack RARES & UNCOMMONS ONLYSmall but mighty, all 5 cards in each booster are of rarity Uncommon or higher, including 13 cards of rarity Rare or higher FOILS & SHOWCASE CARDSEach Epilogue Booster contains 1 Showcase or Retro-Frame card and at least 1 Traditional Foil card CONTENTS1 Epilogue Booster Box containing 24 March of the Machine: The Aftermath MTG Epilogue Boosters Exceptions: Older Magic Sets Arabian Nights, Antiquities, Fallen Empires, The Dark, Homelands From 1993 to 1995 we got five sets that had booster boxes with 60 packs of eight cards each
Other iterations have the hydra grow when mana is spent or when it takes damage
The idea is that Skullclamp is purposely put on 1/1 creatures, which are killed by the -1 to Toughness, giving the owner two free cards