Rush of Knowledge
Sorcery
Draw cards equal to the highest mana value among permanents you control.
Legalities
- brawl: banned
- commander: legal
- legacy: legal
- modern: legal
- pauper: legal
- pioneer: banned
- standard: banned
- vintage: legal
Rulings
- 2020-08-07:
If a permanent on the battlefield has {X} in its mana cost, X is considered to be 0.