Prowling Geistcatcher | Phyrexian Delver | Gray Merchant of Asphodel

(and one other card)

Activate
Blasting Station by tapping it and sacrificing
Prowling Geistcatcher.
When
Prowling Geistcatcher dies, its second ability triggers, returning
Phyrexian Delver and Gray Merchant from exile to the battlefield.
When
Phyrexian Delver and Gray Merchant enter the battlefield, they trigger and
Blasting Station triggers twice.
Resolve the Gray Merchant trigger, causing each opponent to lose an amount of life equal to your devotion to black, and causing you to gain life equal to the life lost this way.
Resolve the
Phyrexian Delver trigger, causing you to return
Prowling Geistcatcher from your graveyard to the battlefield and lose 4 life.
When
Prowling Geistcatcher enters the battlefield,
Blasting Station triggers, untapping
Blasting Station.
Holding priority, activate
Blasting Station by tapping it and sacrificing
Phyrexian Delver.
When
Phyrexian Delver dies,
Prowling Geistcatcher's first ability triggers, exiling
Phyrexian Delver from your graveyard.
Resolve the
Blasting Station ability from step 7, dealing 1 damage to any target.
Resolve a
Blasting Station trigger from step 3, untapping it.
Holding priority, repeat steps 7 through 10 one time, sacrificing Gray Merchant instead.
Resolve the
Blasting Station ability from step 1.
Repeat.