Just posting this here for future reference. "Big Core" was just added to Yu-Gi-Oh! Duel Links with the name "B.E.S. Big Core", and its effect is now written in PSCT.
- "If this card is Normal Summoned: Place 3 counters on it. Cannot be destroyed by battle. At the end of the Damage Step, if this card battles a monster: Remove 1 counter from this card. If you cannot, destroy it."
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