Mecha Phantom Beast Stealthray

When this card inflicts battle damage to your opponent: Special Summon 1 "Mecha Phantom Beast Token" (Machine-Type/WIND/Level 3/ATK 0/DEF 0). This card's Level is increased by the total Levels of all "Mecha Phantom Beast Tokens" you control. While you control a Token, this card cannot be destroyed by battle or card effects. Once per turn: You can Tribute 1 Token, then target 1 Spell/Trap Card on the field; destroy that target.