Mimir, the All-Seeing

Whenever an opponent casts a non-creature
spell, draw a card unless that player pays {1}
At the beginning of the next end step, if you
drew 4 or more cards this turn, transform
Mimir, the All-Seeing.
If Mimir, the All-Seeing dies, exile it instead,
then return it to the battlefield during the
next upkeep.