How can you create a combo with Scholar of New Horizons, Intruder Alarm, Glen Elendra Archmage, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Scholar of New Horizons, Intruder Alarm, Glen Elendra Archmage, Phyrexian Altar

Color identity: WU
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Glen Elendra Archmage, adding one mana of any color.
  2. Glen Elendra Archmage dies, triggering its persist ability, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  3. Glen Elendra Archmage enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  4. Activate Scholar of New Horizons by tapping it and removing the -1/-1 counter from Glen Elendra Archmage, causing you to search your library for a Plains card and either put it onto the battlefield or put it into your hand.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana creatures you control can produce
  - Infinite sacrifice triggers
  - Infinite untap of all creatures
  - Put all Plains cards from your libary into your hand[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Scholar of New Horizons does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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