Jenova, Ancient Calamity {2}{B}{G}
Legendary Creature — Alien
Identity
Golgari
EDHREC rank
#4,131
Cheapest printing
US$1.35
TCGplayer
Printings
4
At the beginning of combat on your turn, put a number of +1/+1 counters equal to Jenova's power on up to one other target creature. That creature becomes a Mutant in addition to its other types.
Whenever a Mutant you control dies during your turn, you draw cards equal to its power.
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.