Wernog in hand or in the command zone or in your graveyard.
All other permanents on the battlefield.
Easy Prerequisites
For each listed card above that is in your graveyard, you must have three additional cards in your graveyard.
Mana Needed
({W} magic symbol) ({B} magic symbol) available.
Steps
Cast
Wernog either from your hand, graveyard or from the command zone by paying ({W} magic symbol) ({B} magic symbol) plus commander tax or exiling three cards from your graveyard, if necessary.
When
Wernog enters, it triggers, causing you to create at least one Food, one Clue and one Treasure.
When the artifact tokens enter,
Grinding Station trigger that many times.
Resolve a
Grinding Station trigger, untapping it.
Holding priority, activate
Grinding Station by sacrificing a Clue or Food, causing you to mill three cards.
Repeat from step 4 one additional time. Then, resolve any remaining
Grinding Station triggers, untapping it.
Activate a Treasure by tapping and sacrificing it, adding ({G} magic symbol) .
Cast
Metamorphosis either from your hand or from your graveyard for its escape cost by paying ({G} magic symbol) and exiling three cards from your graveyard, if necessary, and sacrificing
Wernog.
When
Wernog dies, it triggers, causing you to create at least one Food, one Clue and one Treasure.
Repeat steps 3 through 6 once.
Resolve
Metamorphosis, adding ({W} magic symbol) ({W} magic symbol) ({W} magic symbol) or ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) that can only be spent to cast creature spells.
Activate a Treasure by tapping and sacrificing it, adding ({WB} magic symbol) .