Tornado
{4}{G}
Enchantment
Cumulative upkeep {G} (At the beginning of your upkeep, put an age counter on ~this~, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
{2}{G}, Pay 3 life for each velocity counter on ~this~: Destroy target permanent and put a velocity counter on ~this~. Activate only once each turn.