Somehow drawing a card is linked to your assistant.
D-BT03/073 C 2021 ピアーシング・アシスタント Piercing Assistant
Grade 2 / Normal Unit / Dark States – Elf
AUTO (RC) 1/Turn When you Soul Charge by your card’s ability, if you persona rode this turn, COST [Counter Blast 1], and draw a card.
D-BT03/081 C 異能発現・重力加速 Pull Acceleration
Grade 1 / Blitz Order / Dark States
If your soul has four or more cards, Soul Charge 1, choose one of your opponent’s attacking vanguards, and it gets [Power]-5000 until end of that battle.