Myrkul, Lord of Bones + Devoted Druid

Prerequisites

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Steps

1. 1Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
2. 2Repeat step 1 until Devoted Druid dies as a state-based action due to having zero or less toughness.
3. 3Myrkul 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. 4Activate the Devoted Druid token's first ability by tapping it, adding .
5. 5Activate the Devoted Druid token's second ability by putting a -1/-1 counter on it, untapping it.
6. 6Repeat from step 4.

Effects

• Infinite green mana