Fleet Swallower, and Fraying Sanity

Prerequisites

• Fleet Swallower on the battlefield
• Fraying Sanity on the battlefield
• Fleet Swallower does not have summoning sickness
• Fraying Sanity is attached to an opponent

Steps

1. Declare Fleet Swallower as an attacker
2. Fleet Swallower triggers, causing the opponent enchanted by Fraying Sanity to mill cards equal to half their library size, rounded up
3. At the beginning of your end step, Fraying Sanity triggers, causing the opponent to mill cards equal to the number of cards put into their graveyard this turn

Results

• Infinite mill for target opponent