Gishki Aquamirror

Discard any number of creature cards, and/or
sacrifice any number of creatures with total mana value X, where X is the Ritual Summon value of a
Gishki Ritual creature in your hand or
command zone. Cast that creature.
If this card is in your graveyard, you may pay {u/b}{u/b}{u/b}: Shuffle this card into your library, then
return target Gishki Ritual creature card from
your graveyard to your hand.