300/45 = 6ish wards every 5 minutes. Now, pick 6 5-min wards. Now add up their MP cost. Add 6 rage BPs. Compare that to the 1000mp you get from 5 minutes of Minikin + the 500 you get from Siphon + the 1000 you get from convert + the 300 you get from refresh + the 600 you get from refresh gear (Horn +2, WOTG earring, body) and autorefresh.

Let us know if you are feeling underbuffed or short on mp!