Activate Ashnod's Altar by sacrificing Wingmantle Chaplain, adding {C}{C}.
Wingmantle Chaplain dies, triggering Nim Deathmantle, causing you to pay {4} to return Wingmantle Chaplain from your graveyard to the battlefield, and attach Nim Deathmantle to it.
When Wingmantle Chaplain enters the battlefield, its first ability triggers, creating at least two 1/1 Bird creature tokens.
Activate Ashnod's Altar by sacrificing a Bird, adding {C}{C}.
Repeat.

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Nim Deathmantle

Ashnod's Altar

Wingmantle Chaplain

Activate Phyrexian Altar by sacrificing Wingmantle Chaplain, adding {1}.
Wingmantle Chaplain dies, triggering Nim Deathmantle, causing you to pay {4} to return Wingmantle Chaplain from your graveyard to the battlefield, and attach Nim Deathmantle to it.
When Wingmantle Chaplain enters the battlefield, its first ability triggers, creating at least four 1/1 Bird creature tokens.
Activate Phyrexian Altar three times by sacrificing three Birds, adding {3}.
Repeat.

Infinite colored mana

Phyrexian Altar

Cast Wingmantle Chaplain by paying {3}{W}.
Wingmantle Chaplain's ETB ability and Dormant Sliver each trigger.
Resolve Dormant Sliver's trigger, drawing a card.
Resolve Wingmantle Chaplain's trigger, creating a 1/1 Sliver token with defender for each creature with defender you control.
Wingmantle Chaplain's last ability and Dormant Sliver each trigger once for each token created; put them on the stack in any order.
Resolve a Dormant Sliver trigger, drawing a card.
Resolve a Wingmantle Chaplain trigger, creating a 1/1 Sliver token with defender.
Repeat steps 5 through 7 until there are no cards in your library.
Put Wingmantle Chaplain's and Dormant Sliver's triggers on the stack in any order.
In response, cast Savage Summoning by paying {G}.
Cast Thassa's Oracle by paying {U}{U}.
Thassa's Oracle enters the battlefield and triggers.

Combos with "Wingmantle Chaplain"