Kronika, god of the hourglass

Indestructible
When Kronika enters the field, exile both graveyards. When you do, you may play one artifact or enchantment from your opponents exile pile and one from your own free of mana cost.
Time is a construct: {x}{u} scry ten cards, add X to your hand where X is the amount of mana spent to use this ability.
Should kronika leave the field. Draw cards for amount of blue mana you control that is currently untapped.