Saheeli, Radiant Creator | Karn, the Great Creator | Ugin's Nexus

(and two other cards)

Cast
Ugin's Nexus by paying ({5} magic symbol) .
Saheeli's first ability triggers, causing you to get ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) .
At the beginning of your combat phase,
Saheeli's second ability triggers, causing you to pay ({E} magic symbol) ({E} magic symbol) ({E} magic symbol) to create a token copy of
Ugin's Nexus that is a 5/5 artifact creature.
Put the nontoken
Ugin's Nexus into exile due to the legend rule and its replacement effect, causing you to take an extra turn after this one.
Activate
Karn's first loyalty ability by putting two loyalty counters on it.
At the beginning of the end step,
Saheeli triggers, causing you to sacrifice the
Ugin's Nexus token. The token put into exile due to its replacement effect, causing you to take an extra turn after this one.
Move to your first extra turn.
Activate
Karn's second loyalty ability ability by removing two loyalty counters from it, putting
Ugin's Nexus into your hand from exile.
Move to your second extra turn, and repeat from step 1.