Cost:
: Add or to your mana pool.
, Sacrifice Simic Cluestone: Draw a card.
Cost:
: Add or to your mana pool.
, Sacrifice Selesnya Cluestone: Draw a card.
Cost:
: Add or to your mana pool.
, Sacrifice Rakdos Cluestone: Draw a card.
The other guilds haven't been spoiled yet but it can be safely assumed they will follow the pattern.