Geralf, the Fleshwright + Putrid Goblin + Phyrexian Altar

Prerequisites

• Putrid Goblin does not have a -1/-1 counter on it.
• You have had at least one Zombie enter the battlefield under your control this turn.

Steps

1. 1Activate Phyrexian Altar by sacrificing Putrid Goblin, adding one mana of any color.
2. 2When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. 3When Putrid Goblin enters the battlefield, Geralf's second ability triggers, putting a number of +1/+1 counters on it equal to the number of other Zombies that entered the battlefield under your cotnrol this turn.
4. 4Repeat.

Effects

• Infinite +1/+1 counters on a creature
• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers