
You have no maximum hand size.
Spellbook has 10 printings, first in Exodus (1998). EDHREC ranks it #1,916 among Commander cards. It appears most in Urza, Lord High Artificer decks (4,638 on EDHREC). It has 1 official ruling.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.