You control a creature without summmoning sickness that can tap to produce at least ({1} magic symbol) .
({UP} magic symbol) if the mana-producing creature is not blue available.
Steps
If the mana-producing permanent is not blue, activate Unctus by paying ({UP} magic symbol) , causing the creature to become a blue artifact in addition to its other types until end of turn.
Activate the creature by tapping it, adding at least ({1} magic symbol) .
The creature triggers, causing you to loot.
Tolarian Kraken triggers, causing you to pay ({1} magic symbol) to untap the mana-producing creature.