Dr. Daley, the Big Picture

Prowess, Haste
{x}, {t}: Add {u}{r} to your mana pool, then add X mana in any combination of {r} and/or {u}. Spend this mana only on instants, sorceries, or on costs that contain {x}. X can't be 0.
Whenever you cast a spell or use activated abilities with {x}
in their cost, put a +1/+1 counter on up to one target creature. X can't be 0. Then, If X was 3 or greater, choose one. If X was 7 or greater, choose any number instead. -
•Proliferate.
•Draw a card.
•Remove a counter from