Summoning Station + Pitiless Plunderer + Yahenni, Undying Partisan

Summoning Station

Pitiless Plunderer

Yahenni, Undying Partisan

How it works

1. Activate Summoning Station by tapping it, creating a 2/2 Pincher creature token.
2. Activate Yahenni by sacrificing the Pincher.
3. When the Pincher dies, Pitiless Plunderer triggers, creating a Treasure token.
4. Resolve the Yahenni ability.
5. Activate the Treasure by tapping and sacrificing it, adding one mana of any color.
6. Summoning Station triggers, untapping it.
7. Repeat.