Myrkul, Lord of Bones + Devoted Druid

Steps

1. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
2. Repeat step 1 until Devoted Druid dies as a state-based action due to having zero or less toughness.
3. Myrkul triggers, causing you to exile Devoted Druid and create a token copy of Devoted Druid that is an enchantment and loses all other card types.
4. Activate the Devoted Druid token's first ability by tapping it, adding {G}.
5. Activate the Devoted Druid token's second ability by putting a -1/-1 counter on it, untapping it.
6. Repeat from step 4.