one piece legacy of the master booster box Trading Card Game: Pack OP-12 ( The passionate relationship between such characters as Sanji and Zeff One Piece Card Game –

encore makes it hard to remove profitably without exile-based interaction

Things get a little more complex once we turn to the world of Commander

If we have two Spellskites we can bounce the spell back and forth between them, giving our opponent a poison counter for every 2 life we pay to Spellskite'ss phyrexian mana activated ability

These are explained as fragments of a larger story, and are kept in the Great Illuminary

(This includes morph, manifest, disguise, cloak, and a few other effects that turn cards face down.) Common methods for doing this include using markers or dice, or simply placing them in order on the battlefield