Cast Flickering Ward by paying {W}, attaching it to any creature you control.
Flickering Ward enters the battlefield, triggering Historian's Boon's first ability, creating two 1/1 Soldier creature tokens.
Activate Phyrexian Altar twice by sacrificing the creature with Flickering Ward attached and a Soldier token, adding {W}{W}.
Activate Flickering Ward by paying {W}, returning it from the battlefield to your hand.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Historian's Boon

Phyrexian Altar

Flickering Ward

Parallel Lives

Cast Rancor by paying {G}, attaching it to any other creature you control.
When Rancor enters, Historian's Boon triggers, creating a creature token.
Activate Phyrexian Altar by sacrificing the creature with Rancor attached, adding {G}.
Rancor triggers, returning itself from your graveyard to your hand.
Repeat.

Rancor

Doubling Season

Cast Whip Silk by paying {G}, attaching it to any creature you control.
Whip Silk enters the battlefield, triggering Historian's Boon's first ability, creating two 1/1 Soldier creature tokens.
Activate Phyrexian Altar twice by sacrificing the creature with Whip Silk attached and a Soldier token, adding {G}{G}.
Activate Whip Silk by paying {G}, returning it from the battlefield to your hand.
Repeat.

Whip Silk

Primal Vigor

Combos with "Historian's Boon"