Edison format ruling
Swap Frog
Card text as printed in this eraⓈ You can Special Summon this card (from hand)
by discarding 1 other WATER.
① When this card is Summoned:
You can send 1 Level 2 or lower WATER Aqua from your Deck or face-up-field to the GY.
② Once per turn:
You can return 1 monster you control to the hand;
this turn, you can Normal Summon 1 "Frog" monster (except "Swap Frog" or "Frog the Jam"), in addition to your Normal Summon/Set.
Rulings
- Discarding 1 WATER monster for this card’s Ⓢ is a cost. This does not start a chain.
- You can only use the ② effect once per turn while Swap is face-up. (If Swap leaves the field, and is then resummoned that turn, it can be activated again).
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.