REDU format ruling
Clock Tower Prison
Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Once per turn, during your opponent's Standby Phase: Place 1 Clock Counter on this card. While there are 4 or more Clock Counters on this card, you do not take any battle damage. If this card with 4 or more Clock Counters is destroyed and sent to the GY: Special Summon 1 "Destiny HERO - Dreadmaster" from your hand or Deck.
Rulings
- Putting a Clock Counter on "Clock Tower Prison" can be chained to. The effect to Special Summon "Destiny Hero – Dreadmaster" can also be chained to. Even though this effect can be chained to, it cannot be chained to with an effect that negates the activation of a Spell Card, such as "Magic Jammer" or "Horus the Black Flame Dragon LV8" because the "Clock Tower Prison" card has already resolved.
- The effect that stops Battle Damage is a Continuous Effect that cannot be chained to.
- If "Clock Tower Prison" with 4 or more Clock Counters is destroyed because a new Field Spell Card is activated, "Clock Tower Prison’s" effect will activate.
- If "Spell Canceller" is Summoned or "Imperial Order" is activated, all the Clock Counters will be removed from "Clock Tower Prison".
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.