Saffi Eriksdotter | Samwise the Stouthearted | Phyrexian Altar

(and one other card)

Activate Saffi by sacrificing it, targeting
Samwise.
Saffi dies, triggering
Pitiless Plunderer, creating a Treasure token.
Resolve the Saffi ability.
Activate
Phyrexian Altar by sacrificing
Samwise, adding ({G} magic symbol) .
When
Samwise dies, Saffi and
Pitiless Plunderer trigger.
Resolve the
Pitiless Plunderer trigger, creating a Treasure token.
Resolve the Saffi trigger, returning
Samwise from your graveyard to the battlefield.
When
Samwise enters the battlefield, it triggers, returning Saffi from your graveyard to your hand.
Activate a Treasure by tapping and sacrificing it, adding ({W} magic symbol) .
Cast Saffi by paying ({G} magic symbol) ({W} magic symbol) .
Repeat.