Displacer Kitten + Archaeomender + Welding Jar + Lotus Petal

Displacer Kitten

Archaeomender

Welding Jar

Lotus Petal

How it works

1. Cast Welding Jar by paying 0.
2. Displacer Kitten triggers, blinking Archaeomender.
3. Archaeomender enters the battlefield, returning Lotus Petal from your graveyard to your hand.
4. Activate Welding Jar by sacrificing it, regenerating target artifact.
5. Cast Lotus Petal by paying 0.
6. Displacer Kitten triggers, blinking Archaeomender.
7. Archaeomender enters the battlefield, returning Welding Jar from your graveyard to your hand.
8. Activate Lotus Petal by tapping and sacrificing it, adding one mana of any color.
9. Repeat.