How can you create a combo with Zameck Guildmage, Grazing Kelpie, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Zameck Guildmage, Grazing Kelpie, Phyrexian Altar

Color identity: GU
Mana cost: {G}{U}
Steps:
  1. Activate Zameck Guildmage's first ability by paying {G}{U}, causing each creature you control to enter the battlefield with an additional +1/+1 counter this turn.
  2. Activate Phyrexian Altar by sacrificing Grazing Kelpie, adding one mana of any color.
  3. Grazing Kelpie dies, triggering its persist ability, returning it from your graveyard to the battlefield with no -1/-1 counters due to Zameck Guildmage.
  4. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - 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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