Zameck Guildmage, Grazing Kelpie, and Phyrexian Altar

Prerequisites

• Zameck Guildmage on the battlefield
• Grazing Kelpie on the battlefield
• Phyrexian Altar on the battlefield
• available

Steps

1. Activate Zameck Guildmage's first ability by paying , 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

Results

• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers