Krark, the Thumbless {1}{R}
Legendary Creature — Goblin Wizard
RedCommander: legal
Identity
Red
EDHREC rank
#3,592
Cheapest printing
US$1.79
TCGplayer
Printings
4
Whenever you cast an instant or sorcery spell, flip a coin. If you lose the flip, return that spell to its owner's hand. If you win the flip, copy that spell, and you may choose new targets for the copy.
Partner (You can have two commanders if both have partner.)
Keywords: partner
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.