
As an additional cost to cast this spell, discard X cards.
Search your library for X cards, then shuffle and put those cards on top in any order.
Insidious Dreams has 1 printing, first in Torment (2002). EDHREC ranks it #11,882 among Commander cards. It appears most in Yuriko, the Tiger's Shadow decks (2,028 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.