one piece 500 years in the future booster box Card Game (Japanese) (OP-07) revitalizing the gaming environment between regular product releases and creating even more buzz and anticipation One Piece TCG: 500 Years

Any "as [this permanent] enters" or "[this permanent] enters with" abilities of the new token will work

Yes, there is a whole list of legendary hydras fit to be commanders

Most of the cards that make Legacy expensive are the same cards that make Modern expensive: Snapcaster Mage, Liliana of the Veil, Misty Rainforest, etc

Meren of Clan Nel Toth Meren of Clan Nel Toth is another Golgari commander that exploits Fleshbag Marauder and other edict creatures

There was a time when enter the battlefield triggers on creatures weren't so abundant and this card wouldn't have been nearly as useful, but that time has long passed