Skirk Prospector, Putrid Goblin, and Combine Guildmage

Prerequisites

• Skirk Prospector on the battlefield
• Putrid Goblin on the battlefield
• Combine Guildmage on the battlefield
• Putrid Goblin does not have a -1/-1 counter on it
• Combine Guildmage does not have summoning sickness
• available

Steps

1. Activate Combine Guildmage's first ability by paying and tapping it
2. Activate Skirk Prospector by sacrificing Putrid Goblin, adding
3. When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Combine Guildmage
4. Repeat from step 2

Results

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