Byrgenwerth Great Library

Whenever you cast an Enchantment, Sorcery or Instant, put an Insight counter on Byrgenwerth Great Library.

{t}: Add {w} or {u}.

{t}: Remove X Insight counters. Reduce the cost
of your next Enchantment, Sorcery or Instant this turn by {x}, which may be colorless or blue mana.