Lotus Cobra + Squandered Resources + Amulet of Vigor + Drownyard Temple

Lotus Cobra

Squandered Resources

Amulet of Vigor

Drownyard Temple

How it works

1. Activate Drownyard Temple's first ability by tapping it, adding C.
2. Activate Squandered Resources by sacrificing Drownyard Temple, adding C.
3. Activate Drownyard Temple's second ability by paying 3, returning it from your graveyard to the battlefield tapped.
4. When Drownyard Temple enters the battlefield, Lotus Cobra and Amulet of Vigor trigger.
5. Resolve the Lotus Cobra trigger, adding 1.
6. Resolve the Amulet of Vigor trigger, untapping Drownyard Temple.
7. Repeat.