Elemental Mastery, and Altar Golem

Prerequisites

• Elemental Mastery on the battlefield
• Altar Golem on the battlefield
• Elemental Mastery attached to Altar Golem
• Altar Golem has a power of at least five
• Altar Golem does not have summoning sickness

Steps

1. Activate Altar Golem by tapping it, creating at least five 1/1 Elemental creature tokens with haste
2. Activate Altar Golem by tapping five Elemental tokens, untapping Altar Golem
3. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB
• Infinitely large Altar Golem until end of turn