Havi, the All-Father | Sakashima of a Thousand Faces | Phyrexian Altar

Cards

All permanents on the battlefield (
Sakashima of a Thousand Faces as a copy of
Havi).

Activate
Phyrexian Altar by sacrificing
Sakashima of a Thousand Faces, adding one mana of any color.
When
Sakashima of a Thousand Faces dies, it and
Havi trigger.
Resolve the
Havi trigger, returning
Sakashima of a Thousand Faces from your graveyard to the battlefield as a copy of
Havi.
Resolve the
Sakashima of a Thousand Faces trigger, returning any legendary creature card with mana value 5 or less from your graveyard to the battlefield.
Repeat.

Infinite LTB.
Infinite ETB.
Infinite colored mana.
Infinite sacrifice triggers.
Infinite death triggers.
Put all legendary creature cards with mana value 5 or less from your graveyard onto the battlefield.