Siani, Eye of the Storm {3}{U}
Legendary Creature — Djinn Monk
BlueCommander: legal
Identity
Blue
EDHREC rank
#14,978
Cheapest printing
US$0.28
TCGplayer
Printings
2
Flying
Whenever Siani attacks, scry X, where X is the number of attacking creatures with flying.
Partner (You can have two commanders if both have 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.