Zur, Eternal Schemer, Day of the Dragons, and Phyrexian Altar

Prerequisites

• Zur, Eternal Schemer on the battlefield
• Day of the Dragons in hand
• Phyrexian Altar on the battlefield
• You control at least one additional creature
• available

Steps

1. Cast Day of the Dragons by paying
2. Day of the Dragons enters the battlefield, triggering its first ability
3. Holding priority, activate Zur by paying , causing Day of the Dragons to become a 7/7 creature in addition to its other types
4. Resolve the Day of the Dragons trigger, exiling all creatures you control and creating that many 5/5 Dragon creature tokens
5. Day of the Dragons leaves the battlefield, triggering its second ability
6. Holding priority, activate Phyrexian Altar by sacrificing all Dragon tokens, adding at least
7. Resolve the Day of the Dragons trigger, causing you to sacrifice all Dragons you control and return all cards exiled by Day of the Dragons to the battlefield
8. Repeat from step 2

Results

• Infinite blinking
• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers