Since you have to cast something to trigger heroic, this should leave your hand card-neutral
They put the rest on the bottom in a random order.) If the target artifact or creature has X in its mana cost, that X is 0 when determining its mana value
Brings Dungeons & Dragons themes into Magic: The Gathering
If you exile two legendary cards with The Kenriths Royal Funeral, then you draw two cards and all of your Legendary spells become two mana cheaper to cast for the rest of the game, at the cost of losing life equal to the greatest mana value of a card exiled this way
Classic Delver decks do this by filtering the top of the library for interaction, and then swinging in with a 3/2 Flyer each turn until the opponent is dead
Pair it with cards like Reliquary Tower or Spellbook so you can keep all those cards you draw, as you'll most likely go over the seven count