Kate Stewart, Intruder Alarm, Hourglass of the Lost, and Trazyn the Infinite

Prerequisites

• Kate Stewart on the battlefield
• Intruder Alarm on the battlefield
• Hourglass of the Lost in the graveyard
• Trazyn the Infinite on the battlefield

Steps

1. Activate Trazyn using Hourglass of the Lost's first ability by tapping it, adding and putting a time counter on it
2. Kate's first ability triggers, creating a 1/1 Soldier creature token
3. When the Soldier enters, Intruder Alarm triggers, untapping all creatures
4. Repeat from step 2

Results

• Infinite ETB
• Infinite creature tokens
• Infinite mana creatures you control can produce
• Infinite untap of creatures
• Infinite untap of creatures you control
• Infinite white mana
• Infinitely large creatures you control until end of turn