Zameck Guildmage, and Bloodthrone Vampire

Prerequisites

• Zameck Guildmage on the battlefield
• Bloodthrone Vampire on the battlefield
• available

Steps

1. Activate Zameck Guildmage's first ability by paying , causing your creatures to enter with an additional +1/+1 counter this turn
2. Activate Bloodthrone Vampire by sacrificing the persist creature
3. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it and at least one +1/+1 counter on it due to Zameck Guildmage
4. Remove a -1/-1 counter and a +1/+1 counter from that creature as a state-based action
5. Resolve the Bloodthrone Vampire ability
6. Repeat from step 2

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinitely large creature until end of turn