Ray Fillet, Wave Warrior {2}{U}
Legendary Creature — Fish Mutant
BlueCommander: legal
Identity
Blue
EDHREC rank
#7,107
Cheapest printing
US$0.27
TCGplayer
Printings
2
Flying
Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)
Whenever a creature you control with a counter on it deals combat damage to a player, draw a card.
Every printing
highest TCGplayer market first; a card with only a thin single listing shows its low
In short
A Commander deck is a commander and 99 other cards, one copy of each (except basic lands), all inside the commander's colour identity. Paste a full list into the deck price calculator to price it and check it against the format.