one piece tcg pre release deck TCG: Set 10 Pre-Release Guide and Sealed Formula - This is A Great Looking Sealed Set Character Cost Tony Tony.Chopper - Super Pre-Release

While it never actually got banned in Block or Standard, it easily could have (and possibly should have)

The deck has way too much mana in it with 26 lands for a relatively modest mana curve

This is ideal with self-sac artifacts that dominate like Mindslaver, or ETB/leave play triggers like Solemn Simulacrum

Proxy cards are not allowed generally but in certain conditions, it is allowed to include a proxy card in the deck of a player for a specific game by the judges making it an official proxy

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Left alone, a pure Blue deck tends to stall and run out of ways to actually win