Mikaeus, the Unhallowed, Mindless Automaton, Doubling Season, and Viscera Seer

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Mindless Automaton on the battlefield
• Doubling Season on the battlefield
• Viscera Seer on the battlefield
• Mindless Automaton has two +1/+1 counters on it

Steps

1. Activate Mindless Automaton by removing two +1/+1 counters from it, causing you to draw a card
2. Activate Viscera Seer by sacrificing Mindless Automaton
3. Mindless Automaton's undying ability triggers, returning it to the battlefield with a total of six +1/+1 counters on it
4. Resolve the Viscera Seer ability, scrying 1
5. Activate Mindless Automaton by removing six +1/+1 counters from it, causing you to draw three cards
6. Repeat from step 2

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers