How can you create a combo with Quillspike, Phyrexian Altar, Putrid Goblin?
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[START OF COMBO]This combo can be formed with Quillspike, Phyrexian Altar, Putrid Goblin

Color identity: BG
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Putrid Goblin, adding {B/G}.
  2. When Putrid Goblin dies, its persist ability triggers, returning it to the battlefield from your graveyard with a -1/-1 counter on it.
  3. Activate Quillspike by paying {B/G} and removing the -1/-1 counter from Putrid Goblin, giving Quillspike +3/+3 until end of turn.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinitely large Quillspike until end of turn
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Putrid Goblin does not have a -1/-1 counter on it.
[END OF COMBO PREREQUISITES]
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