Rukarumel, Biologist {W}{U}{B}{R}{G}
Legendary Creature — Human Wizard
Identity
Five-color
EDHREC rank
#10,861
Cheapest printing
US$1.90
TCGplayer
Printings
3
As Rukarumel enters, choose a creature type.
Slivers you control and nontoken creatures you control are the chosen type in addition to their other creature types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield.
{3}, {T}: Create a 1/1 colorless Sliver creature token.
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.