Diddi & Ellah, Bound by choice

This spell can't be countered.

Once during each of your anniversaries, Rossella may show Antonello how much she loves him. If she does, put a promise counter on this card. Diddi & Ella, Bound by Choice gets +X/+X, where X is the number of promise counter on Diddi & Ella.

If this creature would die, you may instead remove a promise counter, it gains indestructible and protection from instants until the end of the turn.