pokemon energy card packs 1x Sword & Shield Sealed Pack - 45 Count psychic and more! Grass Energy

Get your hands on the [English] One Piece Card Game Brook OP15-032 SR

The Japanese sv2a #205 is a Special Art Rare worth several times more

Costing two generic and two black, the minimum this card is likely going to give is -4/-4 in a mono-black deck

Whenever this creature transforms into Sygg, Wanderbrine Shield, target creature you control gains protection from each color until your next turn

Hiding this effect away in your manabase is kind of perfect

It seems very unlikely that the consistency you lose from playing 20 extra cards will decrease your odds of winning by 10% or more, which would mean even discounting any specific Yorion, Sky Nomad synergy, it would be correct for a lot of decks to add some extra cards to meet the Bird Serpent's companion restriction