Seedcradle Witch, Faeburrow Elder, and Quickchange

Prerequisites

• Seedcradle Witch on the battlefield
• Faeburrow Elder on the battlefield
• Quickchange in hand
• Faeburrow Elder does not have summoning sickness
• available

Steps

1. Cast Quickchange by paying , making a creature you control all colors until end of turn
2. Activate Faeburrow Elder by tapping it, adding
3. Activate Seedcradle Witch by paying , giving Faeburrow Elder +3/+3 until end of turn and untapping it
4. Repeat from step 2

Results

• Infinite black mana
• Infinite blue mana
• Infinitely large Faeburrow Elder until end of turn
• Infinite red mana