The Wind

Flying

Whenever you cast a spell, put a +1/+1 counter on
The Wind for each of that spell’s colors.

Remove five +1/+1 counters from The Wind: Add
{w}{w}{u}{u}{b}{b}{r}{r}{g}{g}. Activate only once each turn.

The Wind is one of the three ancient spren of Roshar, predating even the arrival of Singers to the planet.

based on Ramos, Dragon Engine