Hylda of the Icy Crown, Opposition, and Phyrexian Altar

Prerequisites

• Hylda of the Icy Crown on the battlefield
• Opposition on the battlefield
• Phyrexian Altar on the battlefield
• You control at least one additional untapped creature

Steps

1. Activate Opposition by tapping an untapped creature you control, tapping a creature an opponent controls
2. Hylda of the Icy Crown triggers, holding priority, activate Phyrexian Altar by sacrificing the creature tapped in step 1, adding
3. Resolve the Hylda of the Icy Crown trigger, causing you to pay to create a 4/4 Elemental creature token
4. Repeat
5. You may also repeat this loop during each turn

Results

• Tap all creatures opponents control during each turn