Gyre Sage, and Umbral Mantle

Prerequisites

• Gyre Sage on the battlefield
• Umbral Mantle on the battlefield
• Gyre Sage has at least four +1/+1 counters on it and does not have summoning sickness
• Umbral Mantle attached to Gyre Sage

Steps

1. Activate Gyre Sage by tapping it, adding at least
2. Activate Gyre Sage by paying and untapping it, giving it +2/+2 until end of turn
3. Repeat

Results

• Infinitely large Gyre Sage until end of turn
• Infinite green mana