Whenever Gran-Gran becomes tapped, draw a card, then discard a card.
Noncreature spells you cast cost less to cast as long as there are three or more Lesson cards in your graveyard.
Gran-Gran is a one-mana looting engine: tap her every turn (and ideally multiple times per turn) to draw-then-discard, smoothing draws, filling your graveyard, and digging toward answers and payoffs. You play a mono-blue tempo/control game that grinds card advantage while assembling untap loops and a few Lessons to make your spells cheaper, then close with a value-based or combo finish.
Cheap, recastable commander that provides repeatable card filtering for just one mana to deploy
Excellent in the 99 of control shells—loots every combat or untap cycle and fixes your draws
Untap synergies turn her into an explosive draw-discard engine that can churn through half your library
Discard half feeds graveyard payoffs, delve, escape, and flashback while smoothing late-game floods
Mono-blue offers no real reanimation, so the discarded cards are often just gone
The Lesson cost-reduction is hard to enable—few Lessons fit a blue color identity, so it's mostly a bonus, not a plan
She's a tiny 1/1-style body with no protection and dies to any removal, interrupting your engine
Card filtering isn't card advantage—you draw AND discard, so you need outside draw to actually pull ahead
Lacks a built-in win condition and can drift into durdling without a clear closer
Legendary Creature — Human Peasant Ally
less to cast as long as there are three or more Lesson cards in your graveyard.