Gandalf, Party Guest {1}{U}{R}{W}
Legendary Creature — Avatar Wizard
Identity
Jeskai
EDHREC rank
#15,362
Cheapest printing
US$1.56
TCGplayer
Printings
1
At the beginning of combat on your turn, you may cast an instant or sorcery spell with mana value X or less from your hand without paying its mana cost, where X is twice the number of legendary Wizards you control.
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.