Cast Mortus Strider.
Endrek Sahr triggers, creating three 1/1 Thrull tokens.
Sacrifice Mortus Strider and 3 Thrull tokens for {2}{U}{B}.
Mortus Strider returns to your hand.
Repeat.

Infinite colored mana

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite storm count

Endrek Sahr, Master Breeder

Phyrexian Altar

Mortus Strider

Cast Mortus Strider by paying {1} due to Morophon.
Activate Ashnod's Altar by sacrificing Mortus Strider, adding {C}{C}.
When Mortus Strider dies, it triggers, returning itself from your graveyard to your hand.
Repeat.

Infinite colorless mana

Morophon, the Boundless

Ashnod's Altar

Activate Ashnod's Altar by sacrificing Mortus Strider, adding {C}{C}.
Mortus Strider dies, returning itself from your graveyard to your hand.
Cast Mortus Strider by paying {0}.
Repeat.

Aluren

Activate Phyrexian Altar by sacrificing Mortus Strider, adding one mana of any color.
Mortus Strider dies, returning itself from your graveyard to your hand.
Cast Mortus Strider by paying {0}.
Repeat.

Activate Sneak Attack by paying {R}, putting Mortus Strider from your hand onto the battlefield.
Activate Thermopod's second ability by sacrificing Mortus Strider, adding {R}.
Mortus Strider dies, returning itself from your graveyard to your hand.
Repeat.

Sneak Attack

Thermopod

Activate Sneak Attack by paying {R}, putting Mortus Strider from your hand onto the battlefield.
Activate Phyrexian Altar by sacrificing Mortus Strider, adding {R}.
Mortus Strider dies, returning itself from your graveyard to your hand.
Repeat.

Combos with "Mortus Strider"