Willowdusk, Essence Seer {1}{B}{G}
Legendary Creature — Dryad Druid
Identity
Golgari
EDHREC rank
#10,616
Cheapest printing
US$0.29
TCGplayer
Printings
3
{1}, {T}: Choose another target creature. Put a number of +1/+1 counters on it equal to the amount of life you gained this turn or the amount of life you lost this turn, whichever is greater. Activate only as a sorcery.
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.