Primus, Cybertron Unleashed

Flying
Whenever you cast a spell, put a +1/+1 counter on Ramos, Dragon Engine for each
of that spell's colors.
Remove five +1/+1 counters from Ramos:
Add {w}{w}{u}{u}{b}{b}{r}{r}{g}{g} to your mana
pool. Activate this ability only once each
turn.