Muldrotha, the Gravetide | Slick Imitator | Narset's Reversal

(and one other card)

Narset's Reversal and
Beacon of Tomorrows in hand.
Muldrotha and
Slick Imitator on the battlefield.
You have max speed.
({2} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) plus enough mana to cast the extra turn spell each turn available.

Cast
Beacon of Tomorrows by paying its mana cost.
Holding priority, cast
Narset's Reversal by paying ({U} magic symbol) ({U} magic symbol) , targeting
Beacon of Tomorrows.
Holding priority, activate
Slick Imitator by paying ({1} magic symbol) and sacrificing it, copying
Narset's Reversal, with the copy targeting the original
Narset's Reversal.
Resolve the copy of
Narset's Reversal, copying the original
Narset's Reversal targeting
Beacon of Tomorrows, and returning the original
Narset's Reversal to your hand.
Resolve
Beacon of Tomorrows, causing you to take an extra turn after this one.
Cast
Slick Imitator from your graveyard by paying ({1} magic symbol) ({U} magic symbol) .
Repeat each turn.

If you've cast a creature spell using
Muldrotha this turn, you may move to your extra turn, and then do step 6 followed by steps 1-5.