Death's Presence, Krark-Clan Ironworks, and Pentavus

Prerequisites

• Death's Presence on the battlefield
• Krark-Clan Ironworks on the battlefield
• Pentavus on the battlefield
• Pentavus has at least two +1/+1 counters on it
• available

Steps

1. Activate Pentavus's first ability by paying and removing a +1/+1 counter from it, creating a 1/1 Pentavite artifact creature token
2. Activate Krark-Clan ironworks by sacrificing the Pentavite, adding
3. When the Pentavite dies, Death's Presence triggers, putting a +1/+1 counter on Pentavus
4. Repeat

Results

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