Cast the artifact with mana value 2 or less by paying {0} and 3 life.
Aetherflux Reservoir and Blood Funnel trigger.
Resolve the Aetherflux Reservoir trigger, causing you to gain 1 life for each spell you've cast this turn.
Resolve the Blood Funnel trigger, countering the artifact spell.
Repeat.

Infinite damage

Infinite lifegain triggers

Infinite lifegain

Infinite storm count

Noncreature Artifact with MV <= 2 and a Generic Mana Cost

Noctis, Prince of Lucis

Aetherflux Reservoir

Blood Funnel

Cast the noncreature spell.
Blood Funnel triggers; decline to sacrifice a creature and let the spell be countered.
Guile replaces Blood Funnel's countering of the spell; exile the spell and cast it for free again.
Blood Funnel triggers again; repeat this loop for infinite storm count.

Guile

Activate Magus of the Coffers by paying {2} and tapping it, adding at least {B}{B}{B}{B}{B}.
Cast Corpse Dance with buyback by paying {2}{B} due to Blood Funnel.
Blood Funnel triggers, causing you to sacrifice Magus of the Coffers.
Resolve Corpse Dance, returning Magus of the Coffers from your graveyard to the battlefield, giving it haste, and returning Corpse Dance to your hand.
Repeat.
If you control six or more Swamps, this combo nets infinite black mana.

Infinite black mana

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite magecraft triggers

Infinite sacrifice triggers

Corpse Dance

Magus of the Coffers

Activate Witch Engine by tapping it.
Holding priority, cast Corpse Dance with buyback by paying {2}{B} due to Blood Funnel.
Blood Funnel triggers, causing you to sacrifice Witch Engine.
Resolve Corpse Dance, returning Witch Engine from your graveyard to the battlefield, giving it haste, and returning Corpse Dance to your hand.
Resolve the Witch Engine ability from step 1, adding {B}{B}{B}{B} and failing to give an opponent control of Witch Engine as it is a new object.
Repeat.

Witch Engine

Cast Lab Rats with buyback by paying {B}.
Blood Funnel triggers, causing you to sacrifice another creature.
When the creature dies, Pitiless Plunderer triggers, creating a Treasure token.
Resolve Lab Rats, causing you to create a 1/1 Rat creature token and return Lab Rats to your hand.
Activate the Treasure by tapping and sacrificing it, adding {B}.

Pitiless Plunderer

Memory Crystal

Lab Rats

Cast Searing Touch with buyback by paying {R}. Electro, Blood Funnel and Sedgemoor Witch trigger.
Resolve the Electro trigger, adding {R}.
Resolve the Sedgemoor Witch trigger, creating a 1/1 Pest creature token.
Resolve the Blood Funnel trigger, causing you to sacrifice the Pest.
When the Pest dies, it triggers, causing you to gain 1 life.
Resolve the Searing Touch spell.
Repeat.

Searing Touch

Sedgemoor Witch

Electro, Assaulting Battery

Activate Selvala by paying {G} and tapping it, adding at least {2}{B}{G}.
Cast Corpse Dance with buyback by paying {2}{B} due to Blood Funnel.
Blood Funnel triggers, causing you to sacrifice Selvala.
Resolve Corpse Dance, returning Selvala from your graveyard to the battlefield, giving it haste, and returning Corpse Dance to your hand.
Repeat.
If you control another creature with power 5 or greater, this combo nets infinite colored mana.

Combos with "Blood Funnel"