Buoyant Bauble

When Buoyant Bauble blocks a creature, Buoyant Bauble becomes an Enchantment Aura with, "Enchanted creature cannot attack. At the beginning of Buoyant Bauble owner's precombat main phase, they add {c} to their mana pool.", attaches to the blocked creature, and is no longer a creature.
"Dangerous as it is beautiful, this specimen hunts by drawing in prey with its brilliant colors and then sapping them of their energy.
-Tamiyo's Journal