Tyvar, the Pummeler, and Devoted Druid

Prerequisites

• Tyvar, the Pummeler on the battlefield
• Devoted Druid on the battlefield
• You control a creature with power 5 or greater
• Devoted Druid does not have summoning sickness
• available

Steps

1. Activate Tyvar by paying , giving creatures you control at least +5/+5 until end of turn
2. Activate Devoted Druid's first ability by tapping it, adding
3. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
4. Repeat from step 2 four additional times
5. Repeat from step 1

Results

• Infinite green mana
• Infinitely large creatures you control until end of turn