bloodmage is highly abusive. banish/siphon mana is such a funny combo. banish yourself then siphon mana, then put a priest on heal (2x the heal from amplify magic)
there are some basic strats to abuse bloodmage with, but it's fun to experiment!
personally, i found him most effective in a rifle-caster strat as secondary hero (AM first). do what you like & gl.
when you get good, post in my thread for wager games!