How can you create a combo with Matter Reshaper, Phyrexian Altar, Haunted Crossroads?
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[START OF COMBO]This combo can be formed with Matter Reshaper, Phyrexian Altar, Haunted Crossroads

Color identity: B
Mana cost: 
Steps:
  1. Sacrifice Matter Reshaper to Phyrexian Altar, adding {B}.
  2. With Matter Reshaper's trigger on the stack, activate Haunted Crossroads by paying {B}, putting Matter Reshaper from your graveyard on top of your library.
  3. Resolve Matter Reshaper's trigger, revealing Matter Reshaper on top of your library, and putting it on the battlefield.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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