one piece card game romance dawn op-01 OP01-004 R Various illustrations including original work One Piece TCG: OP-01 (Japanese)

This five-mana red and white planeswalker comes in with four loyalty, can create 3/2 spirit tokens, allows you to Discover with a value of four - which means you can cast the next nonland card in your library with a mana value of four or less for free - and lets you exile cards from your graveyard to gain mana, then cast those cards if you want to

Completing the Quest there earns you a Violet Parr Learning New Powers Seasonal Promo card

(Whenever a creature with melee attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.) Each artifact creature you control has melee, trample, and haste

You would get very powerful effects at an efficient mana cost in exchange for giving your opponent a fair warning and the chance to play around the telegraphed effect