REDU format ruling
Lava Golem

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) to your opponent's field by Tributing 2 monsters they control. You cannot Normal Summon/Set the turn you Special Summon this card. Once per turn, during your Standby Phase: Take 1000 damage.
Rulings
This card cannot be Normal Summoned or Set. (S) This card can only be Special Summoned to your opponent's side of the field by Tributing 2 monsters they control. (C) You cannot Normal Summon or Set the turn you Special Summon this card. (1) Take 1000 points of damage during each of your Standby Phases.
- The (S) Special Summon does not start a chain.
- Once Summoned, Call of the Haunted / Return from the Different Dimension can Summon it later.
- You cannot play Bottomless Trap Hole when Summoning this card to your opponent's field.
- You cannot play Black Horn of Heaven when Summoning this card to your opponent's field.
- You can play Solemn Judgment when Summoning this card to your opponent's field.
- You Tribute your opponent's monsters as cost.
- You can't Tribute your opponent's Vanity's Fiend for this Summon.
- You can't Tribute your opponent's non-FIRE monsters while Gozen Match applies.
- You can't Tribute your opponent's non-Fiend-Type monsters while Rivalry of Warlords applies.
- The (C) Condition cannot be negated. It is not an effect.
- You can't Special Summon Lava Golem AFTER you Normal Summon / Set a monster.
- You can't Special Summon Lava Golem if your Normal Summon was negated by Solemn Judgment.
- The (1) mandatory Trigger Effect activates during the Standby Phase of this card's controller.
- This effect deals damage even if this card is flipped face-down / leaves the field / changes control.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.