Felidar Guardian, Reveillark, and Ashnod's Altar

Prerequisites

• Felidar Guardian in hand
• Reveillark on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

1. Cast Felidar Guardian by paying
2. When Felidar Guardian enters the battlefield, it triggers, targeting Reveillark
3. Holding priority, activate Ashnod's Altar by sacrificing Felidar Guardian
4. Resolve the Felidar Guardian trigger, blinking Reveillark
5. When Reveillark leaves the battlefield, it triggers, returning Felidar Guardian and up to one other creature with power 2 or less from your graveyard to the battlefield
6. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite recursion of creature cards with power 2 or less