Despite the enormous, decades-long popularity of the anime and manga its based on, the One Piece Card Game still feels a bit like a plucky underdog in the TCG world
This goes into your 'mana pool'
When you activate Grand Architects first activated ability, Pili-Pala becomes a blue creature and, with the Architects second activated ability, you can tap Pili-Pala for two colorless mana
And maybe you can make it work in a really creature-heavy strategy that wants to blow up a one-drop permanent for each opponent and then maybe hit two or three more the next time around
Free spells, due mostly to the advent of Modern Horizons 2 elementals, are in a very high position at the moment, and trading two for one isnt usually a big problem, if youre taking advantage in the board