Notably you only get the first spell you cast on your turn, so after playing this, your opponent gets the first free spell.
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in what scenario(s) would someone want to run this? the only non-grouphug one I can think of is when you have a way to punish free casts (Vexing Bauble springs to mind) in play; but even then, it hits you as well and they could just not cast their spell for free. Six mana draw seven is still OK, I guess lol
I have no clue when you'd play this. I probably wouldn't, but maybe it can work in commander like you mentioned.
Perhaps on a Dimir mill deck, after playing something like Doomsday Excrutiator so you don't mill yourself?...
that sounds like a plan!