Cost
Sac or discard 5 cards: summon.

Continuous
Prone creatures cannot be sac'ed or consume mana for the purposes of Rift Summoning.
Prone: Prone creatures cannot perform actions. They can use an "get up" action to lose their Prone condition.

Continuous
Prone creatures can Transform at the end of each turn.
Prone: Prone creatures cannot perform actions. They can use an "get up" action to lose their Prone condition.
Transform: When the transform condition is met, you must immediately resolve: "Sac [this]: you can summon from your Extra Deck a [Transformed] creature"

Action
Choose a creature that has a Connection Chain to a face-up artifact you control: chosen creature is knocked Prone.
Prone: Prone creatures cannot perform actions. They can use an "get up" action to lose their Prone condition.