When this card is activated: You can discard 1 card, and if you do, Set 1 Continuous Trap from your Deck or GY, with an effect that Special Summons itself as a monster, except the discarded card. If a card(s) you control is destroyed by battle or card effect, and sent to the GY or banished face-up: You can target 1 of them; add 1 card with the same name from your Deck to your hand. You can only use this effect of "Sudden Thunder Swamp" once per turn. You can only activate 1 "Sudden Thunder Swamp" per turn.