I can see it being good versus Amulet and maybe against Living End, but it will work only once and its possible to play around it to make it not impactful at all
Marshland Bloodcaster lets you do just that, exchanging mana for life total when you go to cast your next spell
I think youll always be reasonably happy with the first copy of this, but running more than that is pretty risky

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If what were blowing up includes mana rocks, then weve paid back part of the spells cost