When Shrieking Drake enters the battlefield, it and Genesis Chamber trigger.
Resolve the Shrieking Drake trigger, returning itself from the battlefield to your hand.
Resolve the Genesis Chamber trigger, creating a creature token.
Activate Phyrexian Altar by sacrificing the creature token, adding .
Repeat.
This clever loop turns a self-bouncing creature into an infinite engine by leveraging a few persistent triggers on the board. Each time you cast Shrieking Drake, Genesis Chamber rewards you with a Myr token upon entry, while the Drake's own triggered ability forces you to pick a creature to return—conveniently pointing right back at the Drake itself to reset the cost. Meanwhile, Phyrexian Altar sits quietly in play waiting to convert those generated Myr tokens into the exact blue mana needed to recast the Drake, sustaining the cycle indefinitely.