japanese machoke pokemon card AR 177/165 Pokemoncard151 Psychic x2 Retreat Cost Machoke (Triumphant 40) - Bulbapedia,

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

This number results from the cut sheets where it's just as easy to produce a single sheet (containing 100) as a single card

One mana to find any dork and put it into your hand is well below the going rate for such things

This enchantment triggers on non-creature spells with a punishing four-mana tax that opponents rarely pay during the opening turns, generating multiple cards before its cumulative upkeep becomes prohibitive

This is an exception to rule 109.2