Walk the Aeons + Call to Mind + Mystic Retrieval + Swarm Intelligence
Walk the Aeons
Call to Mind
Mystic Retrieval
Swarm Intelligence
Requires
Walk the Aeons must be in hand.
Call to Mind must be in hand.
Mystic Retrieval must be in the graveyard.
Swarm Intelligence must be on the battlefield.
Mana needed: 
on each odd-numbered turn, with at most 
available each even-numbered turn
on each odd-numbered turn, with at most available each even-numbered turn
Steps
- Cast Walk the Aeons by paying .
- Swarm Intelligence triggers, copying Walk the Aeons.
- Resolve both Walk the Aeonss, causing you to take two extra turns after this one.
- Move to your next turn.
- Cast etiher Mystic Retrieval or Call to Mind by paying its mana cost, targeting either Call to Mind or Mystic Retrieval in your graveyard.
- Swarm Intelligence triggers, copying Call to Mind or Mystic Retrieval, targeting Walk the Aeons.
- Resolve both Call to Minds or Mystic Retrievals, returning Walk the Aeons and either Call to Mind or Mystic Retrieval from your graveyard to your hand.
- Move to your next turn.
- Repeat.
Results
Infinite turns. Instant/Sorcery with "Return Instant/Sorcery from GY to hand".
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