Cast Through Time + Venser, Shaper Savant + Portal of Sanctuary + Nexus of Fate

Ruthless

Decks

How it works

Cast Nexus of Fate by paying , granting you an extra turn after this one and exiling it due to rebound.
At the beginning of your next upkeep, rebound triggers, causing you to cast the exiled spell without paying its mana cost.
Activate Portal of Sanctuary by tapping it and paying , returning Venser to your hand.
Cast Venser by paying .
When Venser enters the battlefield, they trigger, returning the extra turn spell to your hand.
Repeat each turn.

In which brackets is this combo allowed, per Spellbook's Ruthless tier?

1–2 · Exhibition & Core

Spellbook classifies this as Ruthless — not for these brackets.

3 · Upgraded

Spellbook classifies this as Ruthless — not for these brackets.

4–5 · Optimized & cEDH

All combos are allowed.