REDU format ruling
Destruction of Destiny

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Send 3 cards from the top of your Deck to the Graveyard, and take 1000 damage for each Spell or Trap Card sent to the Graveyard this way.
Rulings
- Sending 3 cards from the top of your Deck to the GY is part of the effect of "Destruction of Destiny". It is not a cost.
- If "Macro Cosmos" is on the field the 3 cards will be removed from play, but you will still take damage for any Spell or Trap Cards.
- You cannot activate "Destruction of Destiny" if you have less than 3 cards in your Deck.
- All the damage is dealt in a single sum. So if you send 3 Spell or Trap Cards you take 3000 damage, not 1000 damage three times.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.