Activate Phyrexian Altar by sacrificing Everflame Eidolon, adding {R}.
Everflame Eidolon leaves the battlefield, causing Nyxborn Rollicker to become an enchantment creature.
Dawn Evangel triggers, returning Everflame Eidolon from your graveyard to your hand.
Cast Everflame Eidolon for its bestow cost by paying {R}, attaching it to Nyxborn Rollicker.
Activate Phyrexian Altar by sacrificing Nyxborn Rollicker, adding {R}.
Nyxborn Rollicker leaves the battlefield, causing Everflame Eidolon to become an enchantment creature.
Dawn Evangel triggers, returning Nyxborn Rollicker from your graveyard to your hand.
Cast Nyxborn Rollicker for its bestow cost by paying {R}, attaching it to Everflame Eidolon.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Dawn Evangel

Phyrexian Altar

Mana Matrix

Nyxborn Rollicker

Everflame Eidolon

Activate Phyrexian Altar by sacrificing Nyxborn Shieldmate, adding {W}.
Nyxborn Shieldmate leaves the battlefield, causing Everflame Eidolon to become an enchantment creature.
Dawn Evangel triggers, returning Nyxborn Shieldmate from your graveyard to your hand.
Cast Nyxborn Shieldmate for its bestow cost by paying {W}, attaching it to Everflame Eidolon.
Activate Phyrexian Altar by sacrificing Everflame Eidolon, adding {R}.
Everflame Eidolon leaves the battlefield, causing Nyxborn Shieldmate to become an enchantment creature.
Dawn Evangel triggers, returning Everflame Eidolon from your graveyard to your hand.
Cast Everflame Eidolon for its bestow cost by paying {R}, attaching it to Nyxborn Shieldmate.
Repeat.

Nyxborn Shieldmate

Combos with "Everflame Eidolon"