Displacer Kitten + Mana Echoes + Gemstone Array + Lluwen, Exchange Student // Pest Friend

Displacer Kitten

Mana Echoes

Gemstone Array

Lluwen, Exchange Student // Pest Friend

How it works

1. Cast the copy of Pest Friend from exile by paying B/G.
2. When you cast that spell, Displacer Kitten triggers, flickering Lluwen, Exchange Student, which enters prepared.
3. When Lluwen, Exchange Student enters, Mana Echoes triggers, adding at least C.
4. Resolve the spell from step 1, creating a 1/1 Pest creature token.
5. When the token enters, Mana Echoes triggers, adding C each time for each Pest you control.
6. Activate Gemstone Array by paying 2, adding one colored mana.
7. Repeat.