Blossom Dryad, Gaea's Cradle, and Umbral Mantle

Prerequisites

• Blossom Dryad on the battlefield
• Gaea's Cradle on the battlefield
• Umbral Mantle on the battlefield

Steps

1. Activate Gaea's Cradle by tapping it, adding at least
2. Activate Blossom Dryad by tapping it, untapping Gaea's Cradle
3. Activate Blossom Dryad by paying and untapping it, giving itself +2/+2 until end of turn
4. Repeat

Results

• Infinitely large Blossom Dryad until end of turn
• Infinite mana lands you control can produce
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinitely large creature until end of turn