REDU format ruling
Last Resort

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Activate only when your opponent's monster declares an attack. You can select 1 "Ancient City - Rainbow Ruins" from your Deck and activate it. If your opponent had an active Field Spell Card when this card was activated, they can draw 1 card.
Rulings
- If your opponent has an active Field Spell Card when you activate this card they can draw 1 card when this card resolves, even if that Field Spell Card is destroyed by an effect Chained to this card’s activation.
- This card is resolved as follows: First, select 1 "Ancient City – Rainbow Ruins" from your Deck and place it in your Field Spell Card Zone, then your opponent’s Field Spell Card is destroyed and they draw one card.
- You cannot activate "Last Resort" if "Field Barrier" is in play, because a new Field Spell Card cannot be played.
- You can activate "Last Resort" while you have a Field Spell Card in your Field Spell Card Zone. When "Last Resort" resolves, the Field Spell Card in your Field Spell Card Zone is destroyed and "Ancient City – Rainbow Ruins" is placed into your Field Spell Card Zone.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.