Edison format ruling
Bubble Shuffle

Card effect (current official text)Target 1 face-up Attack Position "Elemental HERO Bubbleman" you control and 1 face-up Attack Position monster your opponent controls; change both those targets to Defense Position, then Tribute that "Elemental HERO Bubbleman", then Special Summon 1 "Elemental HERO" monster from your hand.
Rulings
- "Bubble Shuffle" is an effect that targets 2 monsters.
- If either target of "Bubble Shuffle" is changed to Defense Position or removed from the field before "Bubble Shuffle" resolves, the entire effect of "Bubble Shuffle" disappears.
- You can target the opponent’s "Elemental Hero Bubbleman" with "Soul Exchange" and Tribute it for "Bubble Shuffle".
- If there is no monster in your hand with "Elemental Hero" in the card name, you cannot activate "Bubble Shuffle".
- You need a face-up Attack Position "Elemental Hero Bubbleman" on the field to activate "Bubble Shuffle". If he’s in Defense Position you cannot activate it.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.