Cast Dyadrine from the command zone by paying {G}{W} plus commander tax, if applicable. Dyadrine will enter the battlefield with a +1/+1 counter on it for each mana spent to cast it.
Activate Ashnod's Altar by sacrificing Dyadrine, adding {C}{C}.
Choose to return Dyadrine from the battlefield to the command zone.
When Dyadrine dies, Resourceful Defense triggers, putting a number of +1/+1 counters on Crystalline Crawler equal to the number Dyadrine had as it died.
Activate Crystalline Crawler by removing all +1/+1 counters placed on it in step 4, adding {G}{W} and then {1} for each remaining counter.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Infinite storm count

Infinite commander casts

Dyadrine, Synthesis Amalgam

Crystalline Crawler

Resourceful Defense

Ashnod's Altar

Cast Dyadrine from the command zone by paying {G}{W} plus commander tax, if applicable, reduced by {1} for each time you've cast Dyadrine this game from the command zone due to Myth Unbound. Dyadrine will enter the battlefield with a +1/+1 counter on it for each mana spent to cast it.
Activate Phyrexian Altar by sacrificing Dyadrine, adding {1}.
Choose to return Dyadrine from the battlefield to the command zone.
When Dyadrine dies, Resourceful Defense triggers, putting a number of +1/+1 counters on Crystalline Crawler equal to the number Dyadrine had as it died.
Activate Crystalline Crawler by removing all +1/+1 counters placed on it in step 4, adding {G}{W} and then {1} for each remaining counter.
Repeat.

Myth Unbound

Phyrexian Altar

Combos with "Dyadrine, Synthesis Amalgam"