Kalain, Reclusive Painter

Legendary Creature — Human Elf Bard • Mana cost: {B}{R} • Adventures in the Forgotten Realms • Uncommon

When Kalain enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")
Other creatures you control enter with an additional +1/+1 counter on them for each mana from a Treasure spent to cast them.

Illustrated by Justine Cruz.