Mathise, Surge Channeler {2}{U}
Legendary Creature — Human Elf Shaman Sorcerer
BlueCommander: legal
Identity
Blue
EDHREC rank
#13,087
Cheapest printing
US$5.51
TCGplayer
Printings
2
Whenever you cast an instant or sorcery spell with mana value 3 or greater, roll a d20.
1-9 | Each player draws a card.
10-19 | You draw a card.
20 | Copy that spell. You may choose new targets for the copy.
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.