Soundwave, Sonic Spy's triggered ability can target only an instant or sorcery card with mana value exactly equal to the amount of damage dealt to the player by creature tokens you control.

The cost is an alternative cost, so it can't be combined with any other alternative costs. It can be combined with any applicable additional costs.

When you cast a spell using its More Than Meets the Eye ability, the card is put onto the stack with its back face up. The resulting spell has all characteristics of that face.

Similarly, an ability of another card that instructs you to "transform" one of these cards will cause you to convert it, even if that ability doesn't use the word "convert."

A spell cast this way enters the battlefield with its back face up.

If you don't cast the copy, it ceases to exist the next time state-based actions are checked. The exiled card stays exiled whether you cast the copy or not.

To determine the total cost of a spell, start with the mana cost or alternative cost (such as a More Than Meets the Eye cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of a spell cast using More Than Meets the Eye is determined by the mana cost on the front face of the card, no matter what the total cost to cast the spell was.

Zero is even.

If a spell you cast without paying its mana cost has an in its mana cost, you must choose 0 as the value of X.

"More Than Meets the Eye [cost]" means "You may cast this card converted by paying [cost] rather than its mana cost." It functions in any zone from which the spell can be cast.

For Soundwave, Superior Captain's abilities, if a spell you are casting has an in its mana cost, use the value chosen for X to determine its total mana value.

The mana value of a converted permanent on the battlefield is equal to the mana value of the card's front face, no matter which face is up.

Any triggered ability of another card that triggers whenever a permanent transforms will also trigger whenever a permanent converts.

Converting a permanent doesn't affect any Auras or Equipment that are attached to it. Similarly, any counters on the permanent will remain on that permanent after it converts. Any continuous effects from a resolved spell or ability will continue to affect it. Any spells or abilities on the stack that target a permanent continue to do so after that permanent converts.

If you copy a permanent spell cast this way, the copy has the characteristics of the card's back face, even though it isn't itself a double-faced card.

The convert keyword action functions the same way as the transform keyword action found on some other cards; to convert a permanent on the battlefield, turn it over so that its other face is up.