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

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite storm count

Dawn Evangel

Phyrexian Altar

Mana Matrix

Nyxborn Shieldmate

Mogis's Warhound

Activate Phyrexian Altar by sacrificing Nyxborn Shieldmate, adding {W}.
When Nyxborn Shieldmate dies, Mortuary and Ashiok's Reaper trigger.
Resolve the Mortuary trigger, putting Nyxborn Shieldmate on top of your library from your graveyard.
Resolve the Ashiok's Render trigger, causing you to draw Nyxborn Shieldmate from your library.
Cast Nyxborn Shieldmate by paying {W}.
Repeat.

Infinite draw triggers

Ashiok's Reaper

Mortuary

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.

Everflame Eidolon

Activate Phyrexian Altar by sacrificing Nyxborn Shieldmate, adding {W}.
Nyxborn Shieldmate leaves the battlefield, causing Nyxborn Rollicker 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 Nyxborn Rollicker.
Activate Phyrexian Altar by sacrificing Nyxborn Rollicker, adding {R}.
Nyxborn Rollicker leaves the battlefield, causing Nyxborn Shieldmate 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 Nyxborn Shieldmate.
Repeat.

Combos with "Nyxborn Shieldmate"