Codex of BrighthearthCodex Shredder Buy + Rings of Brighthearth Buy
It's fairly expensive, but meant for any EDH deck as an alternate means of recursion.
1. Sacrifice Shredder to return a card. Trigger Rings.
2. Pay Rings cost to copy Shredder ability, target Shredder.
3. Shredder returns to hand, then initial activation returns other card to hand.
4. Cast Shredder. Repeat as desired.
Net: : Return target card from your graveyard to your hand.
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